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Singapore, 14 June 2019 – The prevailing Southwest Monsoon conditions are forecast to persist over Singapore and the surrounding region for the rest of June 2019, and extend to October 2019. During this period, the prevailing winds are expected to blow from the southeast or southwest.

2          In the second fortnight of June 2019, the monsoon rain band is forecast to remain over the equatorial region before shifting northwards in the last week of June 2019. Singapore can expect the wet and humid conditions experienced in the first fortnight of June 2019 to extend into the early part of the coming fortnight. A transition to dry and warm conditions is expected towards the end of June 2019. With the possible onset of the traditional dry season over Singapore and the southern Southeast Asia region in July 2019, the dry and warm conditions are likely to persist for the rest of the Southwest Monsoon season.

3          In the second half of June 2019, Singapore can expect thundery showers mostly in the late morning and early afternoon on four to six days. On some of these days, the showers could extend into the late afternoon and evening. On two or three days, Sumatra squalls could bring widespread thundery showers with gusty winds to the island between predawn and morning. Overall, the rainfall for June 2019 is likely to be slightly above-normal for most parts of Singapore.

4          In the coming fortnight, the daily temperature on most days is forecast to range between 25°C and 33°C. The daily maximum temperature could reach up to 35°C in the last week of the month. Warm and humid nights can be expected with night-time temperatures of up to 28°C on some days, in particular when prevailing winds blowing from the southeast bring in warm and humid air from the sea.

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, or the MSS’ Weather@SG app.

REVIEW (1 – 13 June 2019)

6          In the first fortnight of June 2019, the light and variable winds over Singapore and the surrounding region strengthened to blow from the southeast or southwest. This shift in winds in early June 2019 signalled the end of the inter-monsoon period and the start of the Southwest Monsoon season.

7          In the first half of June 2019, the presence of the monsoon rain band over the equatorial region and the passage of the Madden-Julian Oscillation (MJO)[1] which enhanced the development of thunderstorm clouds over the region, brought generally wet weather over Singapore. Most of the thundery showers fell in the late morning and early afternoon due to large-scale wind convergence over the surrounding vicinity. The island-wide moderate to heavy thundery showers in the late morning and early afternoon on 3 June 2019 recorded the highest daily total rainfall of 102.8mm at Bukit Merah.

8          The first half of June 2019 was not as warm compared to May 2019 where maximum temperatures of above 34°C were recorded on most days. In the first half of June 2019, the daily maximum temperature ranged between 28.2°C and 33.9°C. The highest daily maximum temperature of 33.9°C was recorded at Choa Chu Kang and Pulau Ubin on 11 June 2019. There were a few warm nights where the night-time minimum temperature was around 28°C, recorded over the southern and eastern parts of the island. The warm nights were due to prevailing winds blowing from the southeast bringing warm, humid air from the sea over the land.

9          Well above-average rainfall was received across the island in the first fortnight of June 2019. The highest anomaly of 161% above-average was at Paya Lebar. The anomaly was lowest at Choa Chu Kang at 5% above-average.

[1] The MJO is characterised by an eastward propagation of clouds and rainfall over the tropical regions from the Indian Ocean to the western Pacific Ocean, with a period of between 30 and 60 days on average. The MJO consists of two phases – an enhanced rainfall (convection) phase and a suppressed rainfall phase.

CLIMATE STATION STATISTICS

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

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

Expect more thundery showers as Inter-monsoon sets in. Expect afternoon thundery showers on 6-8 days and 2-3 days of morning showers. Warm conditions can still be expected with temperature reaching over 35°C on a few days

Singapore, 1 April 2019 – The dry phase of the Northeast Monsoon that has prevailed over the surrounding region since late January 2019 has ended with the onset of inter-monsoon conditions in end March 2019. The prevailing winds in the region are forecast to become light and variable in direction and are expected to persist through May 2019.

2          During the inter-monsoon period, the monsoon rain band lies near the equatorial region and more showers can be expected over Singapore and the surrounding region. Climatologically, April is the second warmest month of the year, with high lightning activity.

3          Compared to the last fortnight of March 2019, more rain days are expected in the first fortnight of April 2019. During this period, short-duration thundery showers are expected in the afternoon on six to eight days, and could last into the evening on some of these days. In addition, on two or three days in the fortnight, the eastward passage of Sumatra squalls from Sumatra or the Strait of Malacca could bring widespread thundery showers accompanied with gusty winds over Singapore in the morning. Overall, the rainfall for the first fortnight of April 2019 is likely to be near-normal.

4          Despite more rain days expected in the first half of April 2019, warm conditions are still expected to prevail. The daily maximum temperature could soar to over 35°C on a few days, and the daily temperature is expected to range between 25°C and 34°C on most days.  The strong daytime heating of land areas coupled with convergence of winds over Singapore and the surrounding vicinity are conducive for the development of thunderstorm clouds in the afternoon.

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, or the MSS’ Weather@SG app.

REVIEW (1 – 31 March 2019)

6          In March 2019, the dry phase of the Northeast Monsoon prevailed over Singapore and the surrounding region, and the low level winds blew from the northwest or northeast.

7          Singapore experienced drier and warmer than usual conditions in March 2019. This was partly due to the presence of a dry air mass that extended from the Pacific Ocean to parts of Southeast Asia. In the last week of March 2019, the influence of the dry air mass weakened and the monsoon rain band shifted northward closer to Singapore and the surrounding equatorial region. This brought short-duration thundery showers over Singapore in the late afternoon on several days. The daily total rainfall of 94.6mm and 91.7mm from the intense thunderstorms that fell over many areas in the afternoon of 11 March and 21 March 2019 respectively were the highest daily total rainfall recorded in March 2019.

8          In March 2019, the highest daily maximum temperature recorded across the island was at least 35°C on 19 days of the month. The month’s highest daily maximum temperature of 35.9°C was recorded at Choa Chu Kang on 23 March 2019. At the climate station in Changi, the average temperature for March 2019 was 28.7°C. This ranks March 2019 as the third warmest March in Singapore (since temperature records began in 1929) after 2016 and 1998 (both strong El Niño years) with monthly average temperatures of 29°C and 29.5°C respectively. March 2019, together with February 2019, January 2019 and December 2018, are the warmest respective months in the last 90 years that are not influenced by the El Niño. With an average temperature of 28.1°C, the just concluded Northeast Monsoon season (December 2018 – March 2019) is the third warmest on record.

9          Many parts of Singapore received well below-normal rainfall in March 2019. The highest rainfall of 244.0 mm (15% above average) was recorded at Ang Mo Kio. Rainfall was lowest at Sentosa Island where 39.0 mm (80% below average) was recorded.

CLIMATE STATION STATISTICS

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

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

2009-2018 is the warmest decade on record  

 Singapore, 15 January 2019 – 2018 saw a continuation of above-average temperatures over Singapore, with the year recording a mean annual temperature of 27.9°C. This is 0.4°C higher than the 1981-2010[1] long-term average, and 0.2°C warmer than 2017’s mean annual temperature of 27.7°C, making 2018 the joint eighth warmest year on record. Above-average temperatures were recorded in all months in 2018 with the exception of January, when Singapore experienced an extended cool spell on 10 – 14 January.

2          Notably, December 2018 was the second warmest December in Singapore with a monthly mean temperature of 27.6°C, behind December 2015 (27.7°C). The second half of the month was particularly warm; on 28 and 30 December the Changi climate station recorded a daily maximum temperature of 33.8°C, tying the record set on 2 December 1948 for a December day. Temperature records for Singapore started in 1929.

3          Singapore’s top ten warmest years have all occurred in the past 25 years, and eight of them were recorded in this century. Significantly, the last decade from 2009 to 2018 marks the warmest decade on record in Singapore with mean temperature of 27.89°C, surpassing the previous record (1997 to 2006) by 0.02°C. These are signs of the long term warming trend in Singapore.

4          These findings are detailed in a review of Singapore’s weather and climate in 2018 released today by the Meteorological Service Singapore (MSS). The review summarises the main climatic features and notable weather events that affected Singapore in 2018 and is a prelude to the comprehensive Annual Climate Assessment Report which will be released in conjunction with World Meteorological Day in March 2019. The review is available on the MSS website at https://www.weather.gov.sg (please refer to Annex A for an infographic on Singapore’s Climate in 2018).

El Niño Southern Oscillation

5          2018 was largely an El Niño Southern Oscillation (ENSO) neutral year with no significant influence on Singapore’s climate. Weak La Niña conditions prevailed in the first quarter of 2018 and there were signs of a weak El Niño developing towards the end of 2018.

 6          The 2018 annual total rainfall recorded in most parts of the island was close-to-average. At the Changi climate station, however, well below average monthly rainfall was recorded in some months, in particular from February to April. This contributed to an annual total rainfall of 1,708 mm, 21 per cent below the 1981-2010 long-term average.

Notable weather events in 2018         

7          January 2018 was an eventful month for Singapore’s weather. A monsoon surge[2] from 10 to 14 January brought five consecutive days of cool weather across the Island, with the daily minimum temperature dipping to 21.2°C on 14 January. This was the longest cool spell Singapore has experienced in at least two decades. On 30 January, intense thunderstorms brought rain and hailstones over the northern parts of the island. This is relatively rare in the tropics where hailstones usually melt before reaching the ground. On 31 January, a waterspout[3] associated with an intense thunderstorm developed over the sea areas off the east coast of the island. Strong wind gusts from the waterspout blew sail boats on the beach a few meters inland.

8          During the year, heavy rains and strong wind gusts from intense thunderstorms caused several incidents of flash floods, fallen trees and damage to property. In particular, on 30 March, strong wind gusts from an intense thunderstorm caused substantial damage to chicken farms in the Lim Chu Kang area. The wind gust of 133.3 km/h recorded at the nearby Tengah station on that day was the strongest wind gust recorded since 2010.

[1] A “normal climate”, usually termed “Climate Normals”, is the 30-year average of climatological variables, such as temperature and rainfall, updated every 10 years. The current Climate Normals are defined by the baseline period from 1981-2010.  This average is the basis of comparison for recent climate conditions, such as whether the mean temperature for a recent month or year is above or below normal.

[2] A monsoon surge refers to the strengthening of north-easterly winds blowing from a strong high-pressure system over the northern Asian continent toward the South China Sea, bringing periods of prolonged and widespread rain and windy conditions to the surrounding region including Singapore and Peninsular Malaysia.

[3] A waterspout is a rotating column of winds associated with intense thunderstorms over the sea. Typically, waterspouts have strong wind gusts of 40 – 80km/h. They lose their energy quickly upon nearing the coast, and are usually short-lived.

Expect 6-8 days of afternoon thundery showers in the next fortnight. A monsoon surge towards last week of the fortnight likely to bring 1-2 days of more intense thunderstorm activities and occasionally windy conditions. The daily temperatures between 24°C and 33°C on most days.

Singapore, 14 December 2018 –  The prevailing Northeast Monsoon in the region is expected to persist in the next few months, with the low level winds blowing mostly from the northeast or northwest.

2          In the next fortnight, Singapore can expect short-duration thundery showers in the afternoon and evening on six to eight days.  In addition, towards the last week of December 2018, a surge of monsoon winds over the South China Sea is likely to bring converging winds over the region and more intense thunderstorm activities over Singapore on one to two days, accompanied by occasionally windy conditions.   On another one or two days of the fortnight, the prevailing winds are forecast to temporarily blow from the west, bringing thundery showers in the morning.  The rainfall for December 2018 is expected to be near normal.

3          The daily temperatures in the second fortnight of December 2018 are expected to range between 24°C and 33°C on most days. The daily maximum temperature may reach a high of 34°C on a few days, with the minimum temperature dropping to a low of 23°C on days with intense rainfall.

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, or the MSS’ Weather@SG app.

REVIEW (1 – 13 December 2018)

5          Following the onset of the Northeast Monsoon in late November 2018, Singapore and the surrounding region experienced wet weather conditions in the first fortnight of December 2018 as monsoon rain band developed close to the equatorial South China Sea.  Thundery showers fell over many parts of the island in the afternoon on most days during the period. The highest daily total rainfall of 73.4 mm was recorded on 5 December 2018 over the western parts of Singapore near Lim Chu Kang in the late afternoon.

6          Towards the end of the fortnight, a large-scale convergence of northeasterly winds triggered by a moderate monsoon surge over the South China Sea led to the development of intense thundery showers in the afternoon on 11 December 2018.The highest daily total rainfall was recorded at Pulau Ubin  (73.2 mm) and Thomson Road (72.6 mm) on 11 and 12 December 2018 respectively. Floods were reported over several places near Dunearn Road and Eng Neo Road following the heavy downpour on 12 December 2018.

7          During the fortnight, Singapore’s daily maximum temperature ranged between 32.0°C and 33.7°C on most days.  The highest daily maximum temperature of 34.6°C was recorded on 9 December 2018 in the Marina Bay area. The daily minimum temperature ranged between 23.0°C and 24.5°C

8          More than two thirds of the island received above normal rainfall in the first fortnight of December 2018. The highest rainfall of 262.6 mm was recorded in the Jurong Pier area while Changi recorded the lowest rainfall of 52 mm.

CLIMATE STATION STATISTICS FOR DECEMBER (Climatological reference period: 1981 – 2010)

1st fortnight of Nov 2018 to be wetter than last fortnight of Oct 2018. Expect thundery showers on 7–9 days mostly in afternoon but may extend into evening on few days, Widespread rain with gusty winds on 2 or 3 mornings due to Sumatra squalls.

Singapore, 1 November 2018 – Inter-monsoon conditions have set in over Singapore and the surrounding region since late October 2018, and are expected to persist into the first fortnight of November 2018. During the period, the prevailing winds over the region are forecast to be light and variable in direction.

2           The first fortnight of November 2018 is expected to be wetter than the last fortnight of October 2018. On seven to nine days in the first two weeks of November, the prevailing light wind conditions coupled with strong solar heating of land areas during the day is expected to bring moderate to heavy thundery showers over Singapore. These thundery showers are expected to fall mostly in the afternoon, and on a few of these days, the showers may extend into the evening. In addition, on two or three days in the fortnight, widespread thundery showers accompanied with gusty winds are expected over Singapore in the morning due to the passage of Sumatra squalls moving across Singapore from the Strait of Malacca. Frequent lightning activity can also be expected during the first fortnight of the month. Based on long-term statistics, November is the second wettest month in the year after December.  Rainfall for the first fortnight of November 2018 is likely to be above normal.

3          In the first fortnight of November 2018, the daily temperature is expected to range between 24°C and 33°C on most days.  On days with widespread rainfall, the minimum daily temperature could fall to a range between 22 and 24°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, or the MSS’ Weather@SG app.

REVIEW (1 – 31 October 2018)

5         Southwest Monsoon conditions prevailed during first half of October 2018 with the low level winds blowing mainly from the southeast or southwest. In the second half of the month, the low level winds gradually weakened and was light and variable in direction from late October 2018, which signalled the onset of the inter-monsoon period.

6         October 2018 was a generally wet month where thundery showers fell over the island on most days from the second to the last week of the month. The first week of October 2018 was dry and warm. The wet conditions during the month were due to the occurrence of persistent easterly winds that brought moisture from the tropical central Pacific Ocean to the southern Southeast Asia region between 6 and 14 October, and localised sea breeze convergence in the latter half of the month. The highest daily total rainfall recorded in October 2018 was 109.8mm at Sentosa on 9 October 2018. In the second fortnight of October 2018, the highest daily total rainfall recorded was 98mm over Seng Kang. This was the second highest daily rainfall total recorded for October 2018.

7         The daily temperature in October 2018 ranged from 22.5°C to 35.6°C. In the first week of October 2018 where dry and warm conditions were experienced, there were 6 days where the daily maximum temperature recorded was above 34°C. The daily maximum temperature in the first week of October ranged between 32.5°C and 35.6°C. The highest daily maximum temperature of 35.6°C was recorded on 5 October 2018 at Marina Barrage. For the rest of the month where it rained on most days, the daily maximum temperature ranged between 28.4°C and 35.2°C. The lowest daily maximum temperature of 28.4°C was recorded on 14 October 2018 at Choa Chu Kang. For October 2018, the daily minimum temperature ranged between 22.5°C and 26.5°C.

8       The rainfall recorded in October 2018 was well above average over many parts of the island. The highest rainfall of 423.8 mm (101% above average) was recorded at Lim Chu Kang, and the lowest rainfall of 166.2mm (26% below the average) was recorded at Ulu Pandan.

CLIMATE STATION STATISTICS FOR NOVEMBER (Climatological reference period: 1981 – 2010)

More wet weather days expected in the first fortnight of September 2018.  Expect thundery showers in the late morning and early afternoon on 6-8 days, and in the morning on 1-2 days. A few warm days can be expected.

Singapore, 31 August 2018 – The prevailing Southwest Monsoon conditions are expected to persist over Singapore and the region, with the low level winds blowing from the southeast or southwest.

2           In the next fortnight, Singapore and the region can expect more wet days.  During the period, thundery showers are forecast over Singapore mostly in the late morning and early afternoon on six to eight days. In addition, the passage of Sumatra squalls could bring widespread thundery showers accompanied by gusty winds in the morning on one or two days. The rainfall for the first fortnight of September 2018 is likely to be near average for many parts of Singapore.

3          On most days in the fortnight, the daily temperature is forecast to range between 25°C and 33°C.  On a few days with little or no rainfall, warmer conditions with maximum temperatures of around 34°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, or the MSS’ Weather@SG app.

REVIEW (1 – 31 August 2018)

5          In August 2018, Southwest Monsoon conditions persisted over the region, and the low level winds were blowing predominantly from the southeast or southwest.

6          Compared to the first fortnight of August 2018, the second fortnight of the month was wetter due to a return of shower activities in the region.  During the month, the thundery showers fell mostly in the late morning and early afternoon, and the highest daily total rainfall was 90.3 mm recorded at Bukit Batok on 22 August 2018. On that day, large-scale wind convergence brought widespread moderate to heavy thundery showers between the morning and early afternoon.

7          The warmer conditions experienced in the first half of August 2018 gradually eased in the second half of the month with the return of shower activities. On most days in August 2018, the highest daily maximum temperature ranged between 31°C and 33°C.  Warmer temperatures were experienced between 11 and 15 August 2018 and on 27 August 2018, with the daily maximum temperature ranging between 33.9°C and 34.9°C. The daily minimum temperature in August 2018 ranged between 23°C and 27.1°C.

8         Well-below normal rainfall was recorded across the island in August 2018. The lowest rainfall of 43.7 mm (78% below average) was recorded at Choa Chu Kang West. Rainfall was highest at Changi where 121.4 mm (17% below average) was recorded.

CLIMATE STATION STATISTICS FOR SEPTEMBER (Climatological reference period: 1981 – 2010)

Gradual easing of dry and warm conditions with increased showers forecast in 2^nd fortnight of Aug’18. Expect 5-7 days of late morning and early afternoon thundery showers, and 2 or 3 days of morning Sumatra squalls.  A few warm days can still be expected.

Singapore, 16 August 2018 – The prevailing Southwest Monsoon conditions over Singapore and the region are forecast to persist for the rest of August 2018. In the next fortnight, the prevailing winds are forecast to blow from the southeast or southwest.

2          The dry and warm conditions experienced in recent days are expected to ease with a gradual increase in shower activities in the second half of August 2018. During the fortnight, short-duration thundery showers are forecast on five to seven days, with most of the rain falling between the late morning and early afternoon, and may on one or two days extend into the late afternoon. On two or three days, widespread moderate to heavy thundery showers accompanied by gusty winds due to Sumatra squalls can be expected in the morning. The rainfall for the August 2018 is likely to be below average for many parts of Singapore.

3          During the fortnight, the daily temperature is forecast to range between 25°C and 33°C on most days.  Warmer conditions with maximum temperatures of around 34°C and minimum temperatures of around 27°C can be expected on a few days with little or no rain.

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, or the MSS’ Weather@SG app.

REVIEW (16 – 31 August 2018)

5          Southwest Monsoon conditions prevailed over Singapore and the surrounding region in the first fortnight of August 2018, and the low level winds during the period were predominantly from the southeast or southwest.

6          In the first fortnight of August 2018, most of the days were generally dry. Showers fell over the island on a few days during the period. The highest daily total rainfall of 66.7mm was recorded on 4 August 2018 at Changi, when heavy thundery showers fell over the northern and eastern parts of the island between the late afternoon and evening.

7         On most days in the first fortnight of August 2018, the highest daily maximum temperature was between 31°C and 33°C. In particular, between 11 and 15 August 2018, the weather was generally warm with the highest daily maximum temperature ranging between  34.0°C and 34.5°C. The warm conditions were due to dry weather coupled with strong solar heating. The daily minimum temperature in the first two weeks of August 2018 was mostly between 23.9°C and 27.9°C.

8         Well-below normal rainfall was recorded across the island in the first fortnight of August 2018. The lowest rainfall of 4 mm (96% below average) was recorded at Choa Chu Kang West. Rainfall was highest at Changi where 40.4 mm (45% below average) was recorded.

CLIMATE STATION STATISTICS FOR AUGUST (Climatological reference period: 1981 – 2010)

Second half of Jun 2018 to be wetter than the first half of month. Expect mostly short-duration thundery showers (late morning-early afternoon) and few days of widespread showers with gusty winds (predawn hours-morning). A few warm days can also be expected.

Singapore, 14 June 2018 – Southwest Monsoon conditions have set in over Singapore and the surrounding region. These conditions are forecast to prevail for the rest of the month and extend into September 2018. During this season, the low level winds over Singapore and the surrounding region are expected to blow from the southeast or southwest.

2          For the coming fortnight, short-duration thundery showers are expected on five to seven days, mostly in the late morning and afternoon. On two or three days, widespread thundery showers accompanied with occasional gusty winds can be expected between the predawn hours and morning. Compared to the first half of June 2018, the second half of the month is expected to be wetter, and the overall rainfall for June 2018 is likely to be above average over most parts of Singapore.

3          Despite the wetter weather conditions forecast in the next fortnight, warm days can still be expected where the daily maximum temperature on a few days could reach a high of around 35°C. On most days, the daily temperature is forecast to range between 25°C and 34°C. The nights can be relatively warm, in particular on non-rain days. The warm days and nights typically occur when the southeast winds are light and bring warm, humid air from the sea toward the land.

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

REVIEW (1 – 13 June 2018)

5          Southwest monsoon conditions prevailed over Singapore and the surrounding region since early June 2018, and the low level winds blew predominantly from the southeast or southwest.

6          In the first fortnight of June 2018, the occurrence of Sumatra squalls on two consecutive days (on 1 and 2 June 2018) brought widespread thundery showers accompanied by gusty winds over Singapore between predawn hours and the early morning. The thundery showers were heaviest on 2 June 2018 where the highest recorded daily rainfall total was 92.2mm around the Jurong East area. The wet weather experienced on the first few days of the month was followed by several days of dry and warm weather conditions due to stable atmospheric conditions over Singapore and the surrounding region.

7          In the first week of June 2018, there were several days when the daily maximum temperature recorded was above 34°C. The highest temperature recorded in the first half of June 2018 was 35.0°C at the Marina Barrage area on 6 June 2018. At the Changi climate station, the night time temperatures on most days ranged between 26.0°C and 28.3°C, well-above the long-term climatological June mean minimum temperature of 25.4°C. The warm nights experienced were due to warm and humid air over the sea being blown towards land by the prevailing winds. The mean temperature recorded at the Changi climate station in the first half of June 2018 was 29.3°C, 1.0°C warmer than the long-term mean temperature for June.

8         Most parts of Singapore received above-normal rainfall in June 2018. The lowest rainfall of 25 mm (5% below average) was recorded at Admiralty. Rainfall was highest around Clementi where 192.8 mm (160% above average) was recorded.

CLIMATE STATION STATISTICS FOR JUNE (Climatological reference period: 1981 – 2010)

Wetter conditions expected in 2^nd half compared to 1^st half of May 2018. Expect thundery showers on 6 – 8 days between late morning and afternoon, and a few days between predawn and early morning. Warm temperatures expected on some days.

Singapore, 16 May 2018 – The prevailing inter-monsoon conditions are forecast to persist for the rest of May 2018. During this period, the low level winds are expected to be light and variable in direction.

2          Compared to the first half of May 2018, the second half of May 2018 is forecast to be wetter.  In the next fortnight, moderate to heavy short-duration thundery showers are forecast between the late morning and afternoon on six to eight days. In addition, in the last week of the month, the eastward passage of Sumatra squalls could bring widespread thundery showers accompanied by occasional gusty winds to Singapore between the predawn hours and early morning on two or three days. The rainfall for May 2018 is expected to be near normal.

3          May is climatologically one of the warmest months of the year, and the warm conditions experienced on several days in the first half of May 2018 can still be expected in the second fortnight of the month. On a few afternoons, when there is less cloud cover coupled with strong solar heating of land areas, the daily maximum temperature could reach a high of around 35°C On a few nights, the minimum temperature is forecast to be around 27°C, and warm weather conditions can be expected on these nights. On most days, the daily temperature is expected to range between 25°C and 34°C.

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

REVIEW (1 – 15 May 2018)

5         Inter-monsoon conditions prevailed in the first half of May 2018. The prevailing winds during the period were generally light and variable in direction, and most of the thundery showers fell between the late morning and afternoon. There were a few days when the showers extended into the evening. On 13 May 2018, strong convergence of winds to the east and southeast of Singapore brought thundery showers over many areas between the early hours and mid-day. The showers were heavy over the western part of Singapore between 7am and 11am, and the highest daily total rainfall recorded that day was 121.6mm at Choa Chu Kang.

6         During the first half of May 2018, the daily maximum temperature ranged from 30.8°C to 35.2°C.  There were several warm days experienced in the first fortnight of May 2018. On the 3, 4 and 12 May 2018, the daily maximum temperature recorded in the western, northern and southern parts of Singapore were slightly above 35°C. On a few nights in the second week of May 2018, the daily minimum temperatures recorded over many parts of Singapore were above 27°C. The warm night-time temperatures can be attributed to light winds blowing from the southeast which tend to bring warm and humid air from the sea over the land.

7         About half of Singapore received above-normal rainfall during the first fortnight of May 2018. The lowest rainfall of 23.8 mm (70% below average) was recorded at Changi. Rainfall was highest around Choa Chu Kang where 229.0.mm (108% above average) was recorded.

CLIMATE STATION STATISTICS FOR MAY (Climatological reference period: 1981 – 2010)