Category Archives: News

Thundery showers provide some respite to warm days

Singapore, 15 September 2017 – The Southwest Monsoon season has been prevailing since June 2017 and is forecast to persist for the rest of the month. The low level winds over Singapore and the surrounding region are forecast to blow mostly from the southeast or southwest. On some mornings the winds are expected to be generally light and variable in direction.

2          In the second half of September 2017, Singapore can expect thundery showers on six to eight days, mostly in the late morning and early afternoon. In addition, on two or three days in the coming fortnight, widespread thundery showers accompanied by occasional gusty winds, arising from the passage of Sumatra squalls can be expected between the pre-dawn hours and morning. The total rainfall for September 2017 is expected to be slightly above normal.

3          On most days during the fortnight, the daily temperature is expected to range between 24°C and 33°C. On a few days, it is likely to be warm with the daily maximum temperature reaching a high of around 34°C. The lowest daily minimum temperature in the next two weeks could fall to around 23°C on one or two rainy days.

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 – 14 September 2017

5          Southwest Monsoon conditions prevailed over Singapore and the surrounding region in the first fortnight of September 2017. The low level winds during the two weeks were predominantly from the southeast or south.

6         In the first half of September 2017, Singapore experienced thundery showers mostly in the late morning and early afternoon due to strong solar heating of land areas coupled with convergence of winds over Singapore and the surrounding vicinity. On a few days, the thundery showers were due to the passage of a Sumatra squall that moved over Singapore in the predawn and early morning. The heaviest daily rainfall of 94mm was recorded on 10 September 2017 around the Sungei Kadut area.

7          There were a few warm days during the fortnight where the daily maximum temperature reached a high of between 34.1°C and 34.4°C.  The lowest daily minimum temperature recorded ranged between 22.9°C and 23.5°C. At the Changi climate station, the mean monthly temperature recorded for the first fortnight of September 2017 was 28.2°C, which is 0.6°C higher than the long-term mean temperature for September.

8          Most parts of Singapore received below-normal rainfall in the first fortnight of September 2017. The lowest rainfall of 24.1mm (69% below average) was recorded around the Paya Lebar area. Rainfall was highest around the Bukit Panjang area where 146.4mm (53% above average) was recorded.

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

Warm conditions expected on a few days

Singapore, 31 August 2017 – The prevailing Southwest Monsoon season is forecast to extend into September 2017. During this period, the low level winds over Singapore and the surrounding region typically blow from the southeast or southwest, and showers usually occur in the afternoon.

2          In the first half of September 2017, it is expected to be wetter than the last fortnight of August 2017.  Short-duration thundery showers due either to strong solar heating of land areas and/or convergence of winds over Singapore and the surrounding vicinity can be expected between the late morning and afternoon on seven or eight days. On one or two days during the fortnight, widespread thundery showers accompanied with gusty winds (due to the passage of squall lines from the Strait of Malacca over Singapore) are expected between the predawn hours and morning. Rainfall for the first half of September 2017 is expected to be slightly above normal.

3          On most days during the first fortnight of September 2017, the daily temperature is expected to range between 24°C and 33°C. On a few days in the fortnight, warm conditions can be expected where the daily maximum temperature could reach a high of around 34°C. The daily minimum temperature could fall to around 22°C on a few rainy days.

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 – 30 August 2017

5          Southwest Monsoon conditions prevailed over Singapore and the surrounding region in August 2017. The low level winds blew predominantly from the southeast or south during the month.

6         The thundery showers experienced in Singapore in August 2017 fell mostly in the late morning and afternoon, and were due to strong solar heating of land area coupled with the convergence of winds over Singapore and the surrounding vicinity. There were a few days when the thundery showers fell in the predawn hours and early morning due to Sumatra squalls moving across Singapore. The heaviest daily rainfall of 116.8mm was recorded on 6 August 2017 around the Lim Chu Kang area.

7          During the month, there were a few warm days where the daily maximum temperature reached a high of between 34.1°C and 34.4°C.  The lowest daily minimum temperature recorded ranged between 21.7°C and 22.7°C. At the Changi climate station, the mean monthly temperature recorded for August 2017 was 28.1°C, which is slightly warmer than the long-term August average of 27.9°C.

8          Most parts of Singapore received below-normal rainfall in August 2017. The lowest rainfall of 83.8mm (48% below average) was recorded around the Tanjong Katong area. Rainfall was highest around the Choa Chu Kang area where 255.8mm (39% above average) was recorded.

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

A few warm days can still be expected

Singapore, 16 August 2017 – In the second half of August 2017, Singapore and the surrounding region will continue to be influenced by Southwest Monsoon conditions, characterised by low level winds that blow predominantly from the southeast or southwest.

2          The wet weather conditions experienced in the first half of August 2017 are forecast to persist in the second fortnight of August 2017. During the period, short-duration thundery showers due to strong solar heating of land areas are expected on six to eight days, mostly in the late morning and early afternoon. On one or two days within the upcoming two weeks, the occurrence of Sumatra squalls could bring widespread thundery showers accompanied with gusty winds to Singapore between the predawn and early morning. Overall, the rainfall for August 2017 is forecast to be near-normal.

3          The daily temperature for the rest of the month is not expected to deviate significantly from that experienced in the first two weeks of August 2017. On most days, the daily temperature is expected to range between 25°C and 33°C, and on a few days in the later part of the month, warm conditions can be expected with the daily maximum temperature reaching a high of around 34°C.  During the fortnight, the daily minimum temperatures could register a value between 22°C and 23°C, in particular when rain falls over the island for most part of the day.

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 – 15 August 2017

5          In the first fortnight of August 2017, Southwest Monsoon conditions prevailed over Singapore and the surrounding region, with the low level winds blowing predominantly from the southeast or south.

6          Compared to the second half of July 2017 where Singapore experienced several days of dry and warm conditions and with few days of rainfall, the first fortnight of August 2017 experienced wetter weather conditions. The thundery showers in the first half of August 2017 occurred between the late morning and early afternoon on most days and between the predawn and early morning on a few days. The showers were due to convergence of winds either over Singapore or in our immediate surrounding vicinity. The rain was heaviest on 6 August 2017 around the Lim Chu Kang area where the highest daily rainfall recorded was 116.8mm.

7          Although it rained on most days during the first half of the month, there were still a few warm days. The highest daily maximum temperature during the first fortnight ranged between 34.1°C and 34.4°C, and the lowest daily minimum temperature was between 21.7°C and 23.3°C.   At the Changi climate station, the mean monthly temperature recorded in the first half of August 2017 was 28.2°C, which is 0.3°C higher than the long-term mean of 27.9°C for August.

8          About two-third of Singapore received below-normal rainfall in first fortnight of August 2017. The lowest rainfall of 12.4mm (48% below average) was recorded around the Tanjong Katong area. Rainfall was highest around the Choa Chu Kang area where 216.0mm (135% above average) was recorded.

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

A few warm days can still be expected

Singapore, 1 August 2017 – The prevailing Southwest Monsoon conditions are expected to persist in the first fortnight of August 2017.  During this period, the low level winds are forecast to blow from the southeast or southwest.

2          Compared to the dry weather conditions experienced in the past fortnight, higher rainfall can be expected in the first fortnight of August 2017. Short-duration thundery showers are expected on six to eight days between the late morning and early afternoon, and widespread thundery showers accompanied with gusty winds due to Sumatra squalls on one or two days between the predawn and early morning. The rainfall for the first half of August 2017 is forecast to be normal.

3          Although showers are expected on most days in the coming fortnight, a few warm days with daily maximum temperatures reaching as high as 34°C can still be expected. On most days, the daily maximum and minimum temperatures are forecast to be 32°C- 33°C and 23°C-25°C respectively.

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 July 2017

5          In July 2017, Southwest Monsoon conditions prevailed over the region with low level winds blowing mainly from the southeast or south.

6          The first half of the month was wet with moderate to heavy rain over many parts of the island on most days. Most of the thundery showers fell between the late morning and early afternoon. On a few days, the thundery showers were due to the passage of a Sumatra squall that moved over Singapore in the predawn and early morning. The thundery showers were heaviest on 14 July 2017 where the highest daily rainfall recorded was 110.6mm around the Bukit Timah area. In contrast, the second half of July 2017 was generally dry and warm except for some localised showers on a few days.

7          There were several cool nights in the first half of July 2017 due to the moderate to heavy showers experienced during the day. The daily minimum temperature recorded on 10 days in the first half of July 2017 ranged between 22.3°C and 24°C. In comparison, the daily minimum temperatures in the second half of July 2017 ranged between 24.4°C and 26.1°C, and the daily maximum temperatures were between 32.2°C and 34.5°C. At the Changi climate station, the mean monthly temperature recorded for July 2017 was 28.3°C, which is 0.4°C higher than the long-term mean of 27.9°C for July.

8          Most parts of Singapore received below normal rainfall in July 2017. The lowest rainfall of 79.6mm (48% below average) was recorded around the Changi area. Rainfall was highest around the Thomson area where 204.6mm (2% above average) was recorded.

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

Short-duration thundery showers on some days

Singapore, 17 July 2017 – In the second half of July 2017, the weather in Singapore will continue to be influenced by the prevailing Southwest Monsoon, and the low level winds during the period are forecast to blow mostly from the southeast or southwest.

2          For the rest of the month, Singapore can expect four to six days of short-duration thundery showers, mostly in the afternoon, due to strong solar heating of land areas. On one or two days between the predawn and morning, the passage of a Sumatra squall could bring widespread thundery showers with occasional gusty winds to Singapore. The rainfall for July 2017 is forecast to be normal.

3          Compared to the wet weather experienced in the first half of July 2017, the second fortnight of the month is expected to be generally dry and warm. On most days in the second half of July 2017, the daily maximum temperatures are forecast to range between 32°C and 33°C, and could reach a high of around 34°C on a few days.

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 – 16 July 2017

5          Southwest Monsoon conditions prevailed over Singapore and the region in the first fortnight of July 2017. During this period, the low level winds were blowing predominantly from the southeast or southwest.

6          In the first half of July 2017, Singapore experienced moderate to heavy thundery showers on most days between the late morning and early afternoon. The showers were due to strong solar heating of land areas coupled with convergence of winds over Singapore and the immediate surrounding vicinity. The wet weather in the first fortnight of the month was also due to the passage of Sumatra squalls which brought widespread thundery showers with gusty winds to Singapore on some days between the predawn hours and early morning.  During the period, the rain was heaviest on 14 July 2017 in Bukit Timah, where the highest daily rainfall total recorded was 110.6mm.

7          The wet weather in the first fortnight of July 2017 brought several days with cool night time temperatures. The daily minimum temperatures recorded ranged between 22.3°C and 24°C on 10 days. The lowest daily minimum temperature of 22.3°C was recorded around the Marina South area on 12 July 2017. The daily maximum temperature recorded during the fortnight ranged between 28.7°C and 33.7°C.

8          Most parts of Singapore received above normal rainfall in the first fortnight of July 2017. The highest rainfall of 168.4mm (92% above average) was recorded around the Paya Lebar area. Rainfall was lowest around the Changi area where 77.2mm (3% below average) was recorded.

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

A few warm days can still be expected

Singapore, 30 June 2017 – In the first fortnight of July 2017, the weather in Singapore and the surrounding region will continue to be influenced by the prevailing Southwest Monsoon season. During this period, the low level winds are forecast to blow mostly from the southeast or southwest.

2          The wet weather conditions experience in the second half of June 2017 are forecast to persist into the first half of July 2017. Thundery showers due to strong solar heating of land areas are expected mostly in the late morning and early afternoon on five to seven days. In addition, widespread thundery showers with occasional gusty winds due to the passage of a Sumatra squall are expected on two or three mornings during the period. The rainfall for the first half of July 2017 is likely to be normal.

3          On most days in the first two weeks of the month, the daily temperature is expected to range between 25°C and 33°C. In the second half of the fortnight, a few warm days can be expected where the daily maximum temperature could reach a high of around 34°C. The daily minimum temperatures could dip to around 22°C on a few rainy days.

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 – 29 June 2017

5          In June 2017, Southwest Monsoon conditions prevailed over Singapore and the region, and the low level winds were predominantly from the southeast or southwest.

6          There were more showers in the second half of June 2017 compared to the first half of the month. On most days in the month, moderate to heavy thundery showers due to strong solar heating of land areas affected the island in the late morning and afternoon, and extended into the evening on a few days. The passage of Sumatra squalls on a few days, brought widespread thundery showers with gusty winds to Singapore in the morning. The rain was heaviest on 18 June 2017 around the Mandai area where the highest daily rainfall total recorded was 137mm.

7          Singapore experienced dry and warm weather conditions with below average rainfall in the first half of June 2017. During the month, the lowest daily minimum temperature recorded was 21.8°C on 23 June 2017 where the rain was widespread over Singapore. At the Changi climate station, the mean monthly temperature recorded for June 2017 was 28.5°C, which is slightly warmer than the long-term mean of 28.3°C for June.

8          About half of Singapore received below normal rainfall in June 2017. The lowest rainfall of 81.6mm (36% below average) was recorded around the Tanjong Katong area. Rainfall was highest around the Jurong area where 255mm (59% above average) was recorded.

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

A few warm days can still be expected

Singapore, 16 June 2017 –  The prevailing Southwest Monsoon conditions are expected to persist in the second fortnight of June 2017, and the low level winds are forecast to blow predominantly from the southeast or southwest.

2          In the second half of June 2017, six to eight days of short-duration thundery showers mostly in the late morning and afternoon can be expected. In addition, the passage of a Sumatra squall is expected to bring widespread thundery showers with occasional gusty winds to Singapore between the predawn hours and morning on one or two days. Rainfall for June 2017 is likely to be below normal.

3          While more showers are expected in the second fortnight of June 2017 compared to the first fortnight, the daily maximum temperature could still reach a high of around 35°C on a few days. On most days, the daily temperature is forecast to range between 25°C and 34°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 – 15 June 2017

5          Southwest monsoon conditions prevailed over the region in the first half of June 2017, with the low level winds blowing from the southeast or southwest.

6          During the review period, Singapore experienced dry and warm conditions, particularly in the first week of June 2017. The highest daily maximum temperature was 34.9°C recorded at Choa Chu Kang on 5 June 2017. At the Changi climate station, the night time temperatures on most days ranged between 25.8°C and 28.3°C, well above the long-term climatological June mean minimum temperature of 25.4°C. The warm nights 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 2017 was 29.1°C, approximately 0.8°C warmer than the long-term mean temperature for June.

7          In the first half of June 2017, short-duration thundery showers occurred over the island mostly in the late morning and early afternoon on a few days due to strong solar heating of land areas. On 14 June 2017, the passage of a Sumatra squall in the morning brought moderate to heavy thundery showers to Singapore. The thundery showers were heaviest on 10 June 2017 where the highest daily rainfall total recorded was 99.6mm around the Tuas area.

8          Most parts of Singapore received below normal rainfall in the first half of June 2017. The lowest rainfall of 8.6mm (87% below average) was recorded around the Changi area. Rainfall was highest around the Choa Chu Kang area where 116.3mm (36% above average) was recorded.

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

Wet weather expected in second half of May 2017

Singapore, 16 May 2017 – Inter-monsoon conditions characterised by light winds are expected to persist in the next fortnight. Towards the end of the month, the winds are forecast to gradually strengthen and blow from the southeast or southwest as the inter-monsoon conditions gradually transition to Southwest Monsoon conditions around end May/early June 2017.

2          For the second half of May 2017, short-duration thundery showers are expected on six to eight days in the late morning and afternoon, and could extend into the evening on one or two of these days. The thunderstorms can be heavy on some days because of strong convection due to daytime heating of land areas. In addition, widespread thundery showers accompanied by gusty winds due to Sumatra squalls can be expected between the predawn and early morning on two or three days. Overall, the rainfall for May 2017 is forecast to be slightly above normal.

3          For the rest of the month, the daily temperature on most days is expected to range between 24^oC and 33°C. On a few days, the daily maximum temperature could reach a high of 34°C. As the Southwest Monsoon conditions gradually sets in around the end of May/early June 2017, the nights can be relatively warm, in particular on non-rain days. This usually occurs when the weak southeast winds bring warm, humid air from the sea toward the land.

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 – 15 May 2017

5          Inter-monsoon conditions prevailed over the region in the first fortnight of May 2017, and the low level winds were generally light and variable in direction. On some days, the prevailing winds blew from the southwest or west due to the influence of low pressure systems in the nearby region.

6          In the first half of the month, there were a few warm days where temperatures above 34°C were recorded. The highest temperature recorded during the period was 34.5°C around the Seletar area on 9 May 2017. At the Changi climate station, the mean daily maximum temperature recorded in the first fortnight of May 2017 was 28.4°C, which is 0.1°C above the long-term mean for May.

7          On most days in the first half of May 2017, the thundery showers in the late morning and early afternoon were due to strong solar heating of land areas coupled with convergence of winds over Singapore and the surrounding vicinity. On a few dayswidespread thundery showers and gusty winds to Singapore between the pre-dawn and the early morning.  The showers were heaviest on 12 May 2017 where the highest daily rainfall total recorded was 84.4mm around Sentosa.

8          Most parts of Singapore received below normal rainfall in the first fortnight of May 2017. The lowest rainfall of 40.4mm (61% below average) was recorded around the Upper Thomson area. Rainfall was highest around Sentosa where 181.4mm (103% above average) was recorded.

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

Thundery showers mostly in the late morning and afternoon

Singapore, 2 May 2017 – The prevailing inter-monsoon conditions where low level winds are generally light and variable in direction are expected to persist in May 2017. Some warm days and thundery showers occurring mostly in the afternoon are common in the month of May due to the strong daytime heating of land areas.

2          In the first fortnight of May 2017, the prevailing winds are forecast to be light and variable in direction on most days. On some days, with the presence of low pressure systems in the nearby region, a temporary shift in the prevailing winds to blow from the southwest or west can be expected. During this period, short-duration thundery showers are forecast mostly in the late morning and afternoon on six or seven days, and could extend into the evening on a few of these days. On two or three days in the first fortnight, widespread thundery showers and gusty winds due to Sumatra squalls can be expected between the predawn and early morning. Overall, the rainfall for the first half of May 2017 is forecast to be slightly above normal.

3          Based on long-term statistics, May is the second warmest month of the year after April. In the first two weeks of May 2017, the daily temperature on most days is expected to range between 25°C and 34°C. Warm temperatures of between 34°C and 35°C are expected on some days when there is strong solar heating and the winds are light.

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 – 30 April 2017

5          Inter-monsoon conditions prevailed in the region in April 2017, with low level winds that were predominantly light and variable in direction.

6          During the month, Singapore experienced thundery showers mostly in the afternoon due to strong daytime heating of land areas coupled with convergence of winds in the surrounding vicinity. The occurrence of Sumatra squalls on several days in April 2017 brought widespread thundery showers and gusty winds over Singapore between the pre-dawn hours and the early morning. The heaviest rainfall recorded for April 2017 was from a Sumatra squall that brought 102mm of rain in a day. This occurred over the Tuas area on the morning of 21 April 2017.

7          At the Changi climate station in April 2017, it rained on 22 days[1] and the mean temperature recorded was 27.8°C. This is two days more and 0.2°C cooler than the long-term record number of rain days and mean temperature respectively for April. There were several warm days in April 2017 where the daily maximum temperature on these days ranged from 34.1°C to a high of 35.2°C.

8          Most parts of Singapore received above normal rainfall in April 2017. The highest rainfall of 358.4mm (55% above average) was recorded around the Paya Lebar area. Rainfall was lowest around Seletar where 205.2mm (11% below average) was recorded.

[1] A day is considered to have ‘rained’ if the total rainfall for that day is 0.2mm or more.

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