Category Archives: Uncategorized

Singapore, 1 December 2021 – Inter-monsoon conditions prevailed over Singapore in November 2021, with the winds generally light and variable in direction. In the first half of December 2021, the winds around Singapore are expected to strengthen and shift to blow from the northwest or northeast. This change in monsoonal winds signal the start of the Northeast Monsoon season which is expected to extend into March 2022.

2    Climatologically, December is the wettest month of the year. In the first half of December 2021, the strengthening of the high-pressure system over the northern Asian continent is expected to bring northeast monsoonal winds over the South China Sea and equatorial Southeast Asia region, including Singapore. The monsoon rain band is forecast to lie close to the equator and bring shower activities to the surrounding region of Singapore. Singapore can expect short-duration moderate to heavy thundery showers over parts of the island in the afternoon on most days. The showers may extend into the evening on occasions. On a few days during the fortnight, Singapore may experience occasionally windy conditions. During this time, fair weather with brief periods of passing showers can be expected. The rainfall for the first fortnight of December 2021 is expected to be below-average over most parts of Singapore.

3     During the fortnight, the daily temperature is forecast to range between 24°C and 33°C on most days and may reach 34°C on some days when there is little or no cloud cover. On one or two rainy days, daily lows of around 22°C can be expected.

4      For updates of the daily weather forecast, please visit our MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app.

REVIEW (1 –  30 November 2021)

5     In November 2021, inter-monsoon conditions prevailed over Singapore. The low-level winds were generally light and blew mainly from the west or northwest.

6     Singapore experienced short-duration moderate to heavy afternoon thundery showers on most days in November 2021. The showers extended into the evening on a few occasions. On some days, the convergence of low-level winds in the surrounding region of Singapore led to the development of Sumatra squalls over the Strait of Malacca. The Sumatra squalls brought widespread showers with occasional gusty winds over Singapore between the early hours and morning. On 12 November 2021, the lowest minimum temperature of 22.1°C was recorded at Newton following cool and cloudy weather brought about by the passage of a Sumatra squall.

7     On 4 November 2021, strong solar heating of land areas coupled with convergence of winds in the surrounding region led to heavy rain over some parts of Singapore. A total of 118.2mm of rainfall was recorded at Sembawang that day. This was the highest daily rainfall recorded for November 2021.

8     In November 2021, there were 12 days where the daily maximum temperature was 34°C or higher. The passage of dry air mass brought relatively fair and warm weather to the surrounding region of Singapore around the end of November 2021. On 30 November 2021, the daily maximum temperature at Paya Lebar reached a high of 35.4°C.

9    In November 2021, rainfall was mostly below average over the western half of Singapore, and above average over the eastern parts of the island. The highest anomaly of 47% above average was recorded at Simei. The rainfall anomaly at Tuas was 38% below average.

CLIMATE STATION STATISTICS

Long-term Statistics for December
(Climatological reference period: 1991 – 2020)

Historical Extremes for December
(Rainfall since 1869 and temperature since 1929)

Singapore, 16 November 2021 – Inter-monsoon conditions with low-level winds that are light and variable in direction, are expected to continue for most of November 2021.  Towards the end of the month, the winds are forecast to gradually strengthen and shift to blow from the northeast or northwest.

2    The monsoon rain band is forecast to continue to lie over the equatorial Southeast Asia region for the rest of the month. During this period, short-duration moderate to heavy thundery showers are expected over parts of the island in the afternoon on most days. On some of these days, the thundery showers could extend into the evening. The thundery showers may be intense on one or two days as prevailing winds converge around the surrounding region of Singapore. On a few occasions, convergence of winds from the southwest or west over the Strait of Malacca may trigger the development of Sumatra squalls. The squalls are expected to bring widespread thundery showers and gusty winds over Singapore between the pre-dawn hours and morning as they move eastward toward the South China Sea. While the second half of November 2021 is not expected to be as wet as the first half, the overall rainfall for the month is forecast to be above average over most parts of Singapore.

3     In the second fortnight of November 2021, the daily temperature is forecast to range between 24°C and 33°C on most days, and may reach around 34°C on some days when there is less cloud cover.

4      For updates of the daily weather forecast, please visit our MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app.

REVIEW (1 –  15 November 2021)

5     In the first fortnight of November 2021, inter-monsoon conditions prevailed over Singapore, with prevailing winds generally light and variable in direction. On some days, the low-level winds shifted to blow from the southwest or west.

6     The monsoon rain band was located over the equatorial Southeast Asia region, and brought wet weather over Singapore on most days. Thundery showers occurred over most parts of Singapore mainly in the afternoon. On a few days, the passage of Sumatra squalls brought widespread showers with occasional gusty winds to Singapore between the early hours and morning. On 4 November 2021, strong solar heating of land areas coupled with convergence of winds in the surrounding region led to the development of intense thundery showers over Singapore. A total of 118.2mm of rainfall was recorded at Sembawang that day. This was the highest daily rainfall recorded for the first half of November 2021.

7      In the first half of November 2021, there were 5 days when the daily maximum temperature was 34°C or higher. The highest daily maximum temperature of 34.8°C was recorded at Paya Lebar on 14 November 2021. On 12 November 2021, the passage of a Sumatra squall brought cool and cloudy weather to Singapore, and the minimum temperature at Newton dropped to a low of 22.1°C.

8      Most parts of the island received near to above average rainfall in November 2021, except in western Singapore where the rainfall was below average. The highest anomaly of 58% above average rainfall was recorded at Sembawang, while 29% below average rainfall was recorded at Boon Lay.

CLIMATE STATION STATISTICS

Long-term Statistics for November
(Climatological reference period: 1991 – 2020)

Historical Extremes for November
(Rainfall since 1869 and temperature since 1929)

Singapore, 1 November 2021 – Inter-monsoon conditions have been prevailing over Singapore in the second half of October 2021 and are expected to persist into November 2021. In the first half of November 2021, the low-level winds are forecast to be light and variable in direction; and may temporarily blow from the northwest or west on several days.

2     With the monsoon rain band forecast to remain over the equatorial Southeast Asia region, Singapore can expect more wet days in the coming fortnight. During the period, afternoon thundery showers are forecast on most days, with the showers extending into the evening on a few of these days. On a few days, widespread moderate to heavy thundery showers are expected due to large-scale convergence of winds over Singapore and the surrounding region. In addition, the passage of Sumatra squalls could bring widespread thundery showers and gusty winds on a few mornings. The total rainfall for the first half of November 2021 is forecast to be above average over most parts of the island.

3     The daily temperature on most days in the first two weeks of November 2021 is forecast to range between 24°C and 33°C. Although showers are expected on most days of the fortnight, the daily maximum temperature could still reach a high of around 34°C on a few days. In addition, the wetter weather in the coming fortnight may bring relatively lower temperatures to the island on a few days, with daily maximum temperatures below 32.0°C and daily minimum temperatures below 23°C.

4      For updates of the daily weather forecast, please visit our MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app.

REVIEW (1 – 31 October 2021)

5      Singapore and the surrounding region experienced inter-monsoon conditions in the second half of October 2021. The low-level winds that blew predominantly from the southeast or southwest since June 2021 gradually weakened and became mostly light and variable in direction towards the second fortnight of October 2021. The monsoon rain band remained close to the equatorial Southeast Asia region, and brought thundery showers over Singapore on most days in the second half of the month.

6      During the month, short-duration thundery showers fell over a few parts of Singapore in the late morning and afternoon on most days. Compared to the first half of October 2021, Singapore experienced more rain days in the second half of the month. On a few days, large-scale convergence of winds over Singapore and the surrounding vicinity brought widespread moderate to heavy thundery showers. The highest daily total rainfall for October 2021 occurred on 31 October 2021, when 84.8 mm of rain fell around the Sentosa area in the afternoon.

7      October 2021 was a warm month with daily maximum temperatures exceeded 34°C on 17 days. The highest daily maximum temperature of 35.5°C was recorded at Marina Barrage on 12 October 2021. At the Changi climate station, the mean monthly temperature recorded in October 2021 was 28.5°C, which is 0.6°C higher than the long-term mean of 27.9°C for October.

8      Most parts of the island received slightly below-average rainfall in October 2021. The highest anomaly of 40% below average was recorded at Bishan. The eastern part of Singapore was slightly wetter where 19% above average rainfall was recorded around Simei.

CLIMATE STATION STATISTICS

Long-term Statistics for November
(Climatological reference period: 1991 – 2020)

Historical Extremes for November
(Rainfall since 1869 and temperature since 1929)

Singapore, 15 October 2021 – In the second fortnight of October 2021, the prevailing Southwest Monsoon conditions, with low-level winds blowing from the southeast or southwest, are forecast to gradually weaken. The shift in wind conditions signals the end of the Southwest Monsoon and the start of the inter-monsoon period.

2   The inter-monsoon period is characterised by light variable winds, warm weather and thunderstorms that can at times be heavy; and is forecast to last through November 2021.  Lightning activity tends to be higher during the inter-monsoon months than other months of the year.

3    The second fortnight of October 2021 is expected to be wetter compared to the first fortnight. Thundery showers due to strong day-time heating of land areas, coupled with convergence of winds in the surrounding vicinity, are expected in the late morning and afternoon on most days. On a few of these days, the thundery showers could be heavy, due to large-scale convergence of winds over Singapore and the surrounding region. In addition, widespread thundery showers accompanied with gusty winds, can be expected over Singapore on a few days in the morning, due to Sumatra squalls passing from the Strait of Malacca to the South China Sea. With below-average rainfall registered in the first half of the month and above-average rainfall to be expected for the second fortnight, the overall rainfall for October 2021 is expected to be near-average over most parts of Singapore.

4    The daily temperature on most days in the second fortnight of October 2021 is forecast to range between 24°C and 33°C. Although showers are expected on most days of the fortnight, the daily maximum temperature could still reach a high of around 34°C on a few days. Relatively warm and humid nights with minimum night-time temperatures of up to 28°C can be expected on a few nights, particularly over the eastern and southern coastal areas of the island, when southeast winds bring warm, humid air from the surrounding seas.

5     For updates of the daily weather forecast, please visit our MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app.

REVIEW (1 – 14 October 2021)

6    In the first fortnight of October 2021, Southwest Monsoon conditions continued to persist in the region with the low-level winds blowing mostly from the southeast or southwest, and from the west on a few days.

7    The first half of October 2021 was drier and warmer compared to September 2021. Short-duration thundery showers fell over a few parts of Singapore in the late morning and afternoon on most days. On a few days, large-scale convergence of winds over Singapore and the surrounding vicinity brought widespread moderate to heavy thundery showers. The highest daily total rainfall for the first half of October 2021 occurred on 10 October 2021, when 72.4 mm of rain fell around the Changi area in the afternoon.

8    In the past two weeks, there were nine days where maximum temperatures of 34°C or more were recorded. The highest daily maximum temperature of 35.5°C was recorded at Marina Barrage on 12 October 2021 while the lowest daily minimum temperature was 22.3°C recorded at Pasir Panjang on 5 October 2021. There were also a few warm nights, particularly over the southern and south-eastern parts of the island where the night-time minimum temperature was around 28.0°C.

9     Most parts of the island recorded below-average rainfall in the first fortnight of October 2021. About 69% below-average rainfall was recorded at Tengah. The rainfall recorded around Simei was about 74% above-average.

CLIMATE STATION STATISTICS

Long-term Statistics for October
(Climatological reference period: 1991 – 2020)

Historical Extremes for October
(Rainfall since 1869 and temperature since 1929)

Singapore, 16 August 2021 – The prevailing Southwest Monsoon conditions are forecast to persist over Singapore and the surrounding region in the second fortnight of August 2021, with the low-level winds blowing from the southeast or southwest. On a few days during the fortnight, the winds could shift to blow from the east.

2    With the monsoon rain band forecast to remain over the equatorial Southeast Asia region for the rest of the month, Singapore can expect more wet days in the coming fortnight. During the period, short-duration thundery showers are forecast over parts of the island in the afternoon on most days, and the showers could extend into the evening on a few of these days. On a few days during the fortnight, widespread moderate to heavy thundery showers are expected due to the presence of large-scale convergence of winds over Singapore and the surrounding region. In addition, the passage of Sumatra squalls could bring widespread thundery showers and gusty winds over the island on a few mornings. Overall, the total rainfall for August 2021 is forecast to be above average over most parts of the island.

3    The daily temperature on most days in the second fortnight of August 2021 is forecast to range between 24°C and 33°C. Although showers are expected on most days of the fortnight, the daily maximum temperature could still reach a high of around 34°C on a few days. Relatively warm and humid nights with minimum night-time temperatures of up to 28°C, particularly over the eastern and southern coastal areas of the island can be expected on a few days when prevailing southeast winds bring warm, humid air from the surrounding seas.

4      For updates of the daily weather forecast, please visit our MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app.

REVIEW (1 – 15 August 2021)

5      In the first half of August 2021, Southwest Monsoon conditions persisted over the region, and the low-level winds were blowing from the southeast or southwest.

6      Compared to the second fortnight of July 2021, the first fortnight August 2021 was wetter due to a return of showers in the region. During the first fortnight of the month, thundery showers fell mostly in the afternoon and there were a few days where Sumatra squalls brought thundery showers in the morning. On 1 August 2021 in particular, a Sumatra squall brought heavy thundery showers with gusty winds over many parts of Singapore in the morning. The daily total rainfall of 97.8mm recorded at Choa Chu Kang that day was the highest daily rainfall for the first half of August 2021.

7      The return of showers in the first fortnight of August 2021 brought some respite to the warm weather in the second half of July 2021. On most days in the first two weeks of August 2021, the highest daily maximum temperature was below 34°C. The lowest daily minimum temperature recorded during the period was 21.9°C at Pulau Ubin on 3 August 2021.

8      There were still a few warm days in the first fortnight of August 2021. The highest daily maximum temperature of 34.9°C was recorded at Marina Barrage on 3 August 2021. There were also a few warm nights, particularly over the southern and south-eastern parts of the island where the night-time minimum temperature was around 28.0°C.

9      Slightly more than half of the island recorded above average rainfall in the first half of August 2021, with most of the rain falling in the western half of Singapore. The highest anomaly of 128% above average was recorded at Jurong West. The anomaly was lowest at Yio Chu Kang at 37% below average.

CLIMATE STATION STATISTICS

Long-term Statistics for August
(Climatological reference period: 1991 – 2020)

Historical Extremes for August
(Rainfall since 1869 and temperature since 1929)

Singapore, 2 August 2021 – In the first fortnight of August 2021, more thundery showers are expected compared to the last fortnight of July 2021. During the period, the prevailing Southwest Monsoon conditions are expected to persist over Singapore and the surrounding region, with low-level winds forecast to continue blowing from the southeast or southwest.

2    In the first fortnight of August 2021, the monsoon rain band is forecast to lie close to the Equator. This is expected to bring more rainfall over the equatorial Southeast Asia region. On most days in the fortnight, short-duration thundery showers are expected between the late morning and afternoon over parts of the island. On some of these days, the thundery showers could be heavy due to strong day-time heating of land areas coupled with convergence of winds over Singapore and the surrounding vicinity. On a few days in the fortnight, the passage of a Sumatra squall is expected to bring widespread thundery showers with gusty winds to Singapore between the predawn hours and morning. The rainfall for the first fortnight of August 2021 is forecast to be above average over most parts of the island.

3     While more showers are expected in the coming fortnight, there could still be a few warm days with daily highs of around 34°C. On most days, the daily temperature is forecast to range between 24°C and 33°C. On a few nights, it can be relatively warm and humid when southeast winds blow warm and humid air from the sea toward land. Night-time minimum temperatures of up to 28°C can be expected, particularly over the eastern and southern coastal areas of the island.

4      For updates of the daily weather forecast, please visit our MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app.

REVIEW (1 – 31 July 2021)

5      In July 2021, Southwest Monsoon conditions prevailed over Singapore and the surrounding region, and the low-level winds blew mostly from the southeast or southwest. There were some days when the winds blew from the west.

6      The first half of July 2021 was much wetter than the second half of the month. Thundery showers fell over parts of the island between the late morning and afternoon on most days due to strong day-time heating of land areas. Large scale convergence of winds over Singapore and the surrounding region brought moderate to heavy thundery showers on a few days. On  12 and 13 July 2021 in particular, there were several spells of widespread moderate to heavy thundery showers with occasional gusty winds over Singapore. The daily total rainfall of 114.2mm recorded at Bukit Panjang on 13 July 2021 was the highest daily total rainfall for July 2021. The highest daily total rainfall on 12 July was 100.2mm at Ulu Pandan.

7       In July 2021, there were 14 days with daily maximum temperatures above 34°C. Most of these days were in the second half of the month where the weather was generally dry and warm. There were also several warm nights, particularly over the southern and south-eastern parts of the island where the night-time minimum temperature was around 28.0°C.

8       The highest daily maximum temperature for July 2021 was 35.2°C recorded at Marina Barrage on 30 July 2021. The lowest daily minimum temperature of 22.5°C was recorded at Admiralty on 13 July 2021.

9       The rainfall was above average over many parts of the island in July 2021. The highest rainfall anomaly of 108% above average was recorded at Tai Seng. The anomaly was lowest at Tuas at 22% below average.

CLIMATE STATION STATISTICS

Long-term Statistics for August
(Climatological reference period: 1991 – 2020)

Historical Extremes for August
(Rainfall since 1869 and temperature since 1929)

Singapore, 1 July 2021 – The prevailing Southwest Monsoon conditions are forecast to persist over Singapore and the surrounding region in July 2021. In the coming fortnight, the low-level winds are expected to continue blowing from the southeast or southwest, and the monsoon rain band is forecast to lie over the equatorial Southeast Asia region. This is expected to bring more showers over Singapore compared to the last fortnight of June 2021.

2   In the first week of July 2021, short-duration thundery showers are expected mostly between the morning and early afternoon. On a few of these days, prevailing winds in the region are forecast to converge over Singapore and the surrounding vicinity. This may influence the development of Sumatra squalls and bring widespread thundery showers and gusty winds over Singapore between the predawn hours and morning. In the latter half of the fortnight, localised short-duration thundery showers can be expected on most days due to strong day-time heating of land areas. Overall, the rainfall for the first half of July 2021 is expected to be near normal over most parts of the island.

3     During the fortnight, the daily temperature on most days is forecast to range between 24°C and 33°C. There can be a few warm days, particularly in the latter half of the fortnight where the maximum temperature could reach around 34°C. On a few nights, warm and humid conditions with night-time minimum temperatures of 28°C can be expected when prevailing winds from the southeast or south blow warm and humid air from the sea.

4      For updates of the daily weather forecast, please visit our MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app.

REVIEW (1 – 30 June 2021)

5    Southwest Monsoon conditions prevailed over Singapore and the surrounding region in June 2021. During this period, the low-level winds blew mostly from the southeast or southwest.

6    During the month, short-duration thundery showers fell over parts of the island mostly between the late morning and early afternoon. On a few days, the eastward passage of Sumatra squalls from the Strait of Malacca to the South China Sea brought thundery showers and gusty winds over Singapore in the early morning and in the night. On 29 June 2021, convergence of prevailing winds over Singapore and the surrounding region brought a few spells of thundery showers over many parts of the island in the morning, afternoon, and again in the night. The highest daily total rainfall recorded that day was 134.4mm at Pasir Panjang. This was the highest daily total rainfall for June 2021.

7    June 2021 was a generally warm month. There were 17 days where the daily maximum temperature across the island was above 34°C. The highest daily maximum temperature of 35.5°C was recorded at Marina Barrage on 4 June 2021. There were several warm nights in the first half of the month where the minimum night-time temperatures ranged between 28.0°C and 29.2°C, particularly over the southern parts of the island. The lowest daily minimum temperature recorded in June 2021 was 22.1°C on 13 and 29 June arising from spells of thundery showers that fell throughout most parts of the day and night.

8    In June 2021, rainfall was above average over most parts of Singapore. The highest rainfall anomaly of 84% above average was recorded at Lim Chu Kang. The anomaly was lowest at Changi at 31% below average.

CLIMATE STATION STATISTICS

Long-term Statistics for July
(Climatological reference period: 1991 – 2020)

Historical Extremes for July
(Rainfall since 1869 and temperature since 1929)

Singapore, 16 Jun 2021 – The prevailing Southwest Monsoon conditions over Singapore and the surrounding region are expected to persist for the rest of June 2021. During this period, the monsoon rain band is forecast to lie further north of the Equator, and the low-level winds are expected to blow from the southeast or southwest.

2    The warm and humid conditions in the first half of June 2021 are forecast to continue for the rest of the month. During the second half of June 2021, the daily temperatures are expected to range between 25°C and 34°C on most days and the daily maximum temperature could reach around 35°C on days where there is little or no rain. Warm and humid conditions can also be expected on some nights when prevailing winds from the southeast or south blow warm and humid air from the sea. On these nights, minimum night-time temperatures of up to 28°C can be expected, particularly over the south-eastern parts of the island.

3    On a few days in the early part of the coming fortnight, a mass of dry air from the Indian Ocean is forecast to move over the equatorial Southeast Asia region. The passage of dry air is expected to bring fair and warm weather over Singapore and the surrounding region. On some days during the fortnight, localised short-duration thundery showers are forecast over parts of the island in the late morning and early afternoon due to strong day-time heating of land areas. On one or two days, widespread thundery showers with gusty winds due to Sumatra squalls are forecast between the pre-dawn hours and morning. Overall, the rainfall for June 2021 is expected to be below normal over some parts of Singapore.

4      For updates of the daily weather forecast, please visit our MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app.

REVIEW (1 – 15 June 2021)

5    In the first half of June 2021, the light and variable winds over Singapore and the surrounding region strengthened to blow from the southeast or southwest. This shift in the winds in early June 2021 signalled the end of the inter-monsoon period and the start of the Southwest Monsoon season.

6    During the first fortnight of the month, thundery showers fell mostly over the western half of the island in the late morning and afternoon due to strong solar heating of land areas coupled with localised convergence of winds. There were also a few days when thundery showers fell during the night and in the pre-dawn hours. On 15 June 2021, moderate to heavy thundery showers fell mainly over the western and northern parts of the island in the afternoon. The daily total rainfall of 93.8mm recorded at Mandai that day was the highest daily rainfall for the first half of June 2021.

7    The first fortnight of June 2021 was generally warm. There were 9 days where the daily maximum temperature was above 34°C. The highest daily maximum temperature of 35.5°C was recorded at Marina Barrage on 4 June 2021. There were also a few warm nights, particularly over the southern parts of the island where the minimum night-time temperatures ranged between 28.0°C and 29.2°C.

8    In the first half of June 2021, rainfall was below average for most parts of Singapore except in the north-western parts of the island where rainfall was above average. The highest rainfall anomaly of 138% above average was recorded at Choa Chu Kang. The anomaly was lowest at Sentosa at 61% below average.

CLIMATE STATION STATISTICS

Long-term Statistics for June
(Climatological reference period: 1991 – 2020)

Historical Extremes for June
(Rainfall since 1869 and temperature since 1929)

Singapore, 1 Jun 2021 – The current warm and humid conditions are forecast to continue into the first fortnight of June 2021. During this period, the prevailing light and variable winds over Singapore and the surrounding region are forecast to strengthen and blow from the southeast or southwest. This signals the end of the inter-monsoon period and the start of the Southwest Monsoon season. The Southwest Monsoon season typically extends into September and is a generally drier season compared to other times of the year.

2      In the first half of June 2021, the monsoon rain band is forecast to lie over the northern Southeast Asia region. This is expected to bring generally dry, warm, and humid conditions over Singapore and the surrounding region on some days. Localised short-duration showers at times with thunder can be expected over a few parts of the island in the late morning and early afternoon on some days. In addition, on one or two days, Sumatra squalls moving from the Strait of Malacca to the South China Sea are expected to bring island-wide thundery showers with occasional gusty winds in the morning. The overall rainfall for the first half of June 2021 is likely to be below normal over most parts of Singapore.

3      During the fortnight, the nights are also expected to be warm and humid. Warm nights typically occur when the prevailing winds blow from the southeast and brings warm, humid air from the sea over the land. Night-time minimum temperatures of up to 28°C can be expected on some days. The daily temperature on most days is forecast to range between 25°C and 34°C. The daily maximum temperature could reach around 35°C on a few days, particularly when there are few clouds in the sky.

4      For updates of the daily weather forecast, please visit our MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app.

REVIEW (1 – 31 May 2021)

5      Inter-monsoon conditions prevailed over Singapore and the surrounding region in May 2021. During the month, the low-level prevailing winds were generally light and blew from the east, southeast or southwest.

6      In May 2021, thundery showers fell over parts of the island on most days, mainly in the late morning and afternoon. The showers were due to strong daytime heating of land areas and/or convergence of winds over Singapore and the surrounding vicinity. The heaviest thundery showers during the month occurred on 17 and 18 May 2021, particularly over the western and central parts of the island. On both days, convergence of winds over Singapore and the surrounding vicinity brought thundery showers in the late morning and early afternoon and again in the night. The highest rainfall recorded on 17 May 2021 was 117.2mm at Jurong West. On 18 May 2021, the daily total rainfall recorded at Toa Payoh was 132.0mm, which is the highest daily total for May 2021.

7      Climatologically, May is one of the warmest months of the year. In May 2021, the highest daily maximum temperature recorded across the island was at least 34°C on 18 days. The highest daily maximum temperature of 35.7°C was recorded at Marina Barrage on 11 May 2021. There were also a few warm nights where the night-time temperature was around 28°C particularly over the south-eastern part of the island.

8      Rainfall was slightly above average for most parts of Singapore in May 2021. The highest rainfall anomaly of 69% above average was recorded at Jurong. The anomaly was lowest at Kranji at 56% below average.

CLIMATE STATION STATISTICS

Long-term Statistics for June
(Climatological reference period: 1991 – 2020)

Historical Extremes for June
(Rainfall since 1869 and temperature since 1929)

Singapore, 17 May 2021 – The prevailing inter-monsoon conditions over Singapore and the surrounding region are expected to persist for the rest of May 2021. During this period, the light and variable low-level winds are forecast to gradually strengthen to blow from the southeast or southwest in the latter half of the fortnight.

2      In the second fortnight of May 2021, short-duration thundery showers are expected over parts of the island in the late morning and early afternoon on some days due to strong daytime heating of land areas. On a few days, convergence of low-level winds over the Strait of Malacca may trigger the development of Sumatra squalls. The eastward passage of the squall toward the South China Sea is expected to bring widespread thundery showers and gusty winds over Singapore between the predawn hours and morning.

3      In the latter half of the fortnight, the monsoon rain band is forecast to shift further north of the Equator, away from Singapore. This is expected to bring less rainfall over the equatorial Southeast Asia region, including Singapore. In addition, with a low pressure system forecast to develop over the northern South China Sea, this could bring drier and warmer conditions over Singapore and the surrounding region. Overall, the rainfall for May 2021 is expected to be below average over some parts of the island.

4      For the rest of May 2021, it is expected to be warm and the daily temperature is forecast to range between 24°C and 34°C on most days. With drier weather in the latter half of the fortnight, warmer conditions can be expected with daytime temperatures around 35°C on some days. The weather during the night can be warm when prevailing winds blow from the southeast or south, bringing warm and humid air from the sea over the land. Night-time temperatures of around 28°C are expected on some nights.

5      For updates of the daily weather forecast, please visit our MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app.

REVIEW (1 – 16 May 2021)

6      Inter-monsoon conditions prevailed over Singapore and the surrounding region in the first half of May 2021, and the prevailing winds were generally light and blew from the east or southeast. On some days, the prevailing winds shifted to blow from the southwest.

7      In the first fortnight of May 2021, there were thundery showers mainly in the late morning and afternoon over many parts of the island due to strong daytime heating of land areas. On a few of these days, the thundery showers were intense due to convergence of winds in the surrounding region. There were thundery showers over some parts of the island on a few nights.

8      On 5 May 2021, moderate to heavy thundery showers fell over the northern and central parts of Singapore in the afternoon. The daily total rainfall of 113.6mm recorded at Upper Peirce Reservoir that day was the highest daily total for the first half of May 2021.

9      The warm weather in April 2021 continued into the first half of May 2021. There were 9 days where maximum temperatures of 34°C or more were recorded. The highest daily maximum temperature of 35.7°C was recorded at Marina Barrage on 11 May 2021.

10     Rainfall was near-average for most parts of Singapore in the first half of May 2021. The highest anomaly of 73% above average was recorded at Jurong West. The lowest anomaly of 58% below average was at Kranji.

CLIMATE STATION STATISTICS

Long-term Statistics for May
(Climatological reference period: 1981 – 2010)

Historical Extremes for May
(Rainfall since 1869 and temperature since 1929)