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Singapore, 16 October 2018 – In the second fortnight of October 2018, the low level southeasterly or southwesterly winds are forecast to gradually weaken to become light and variable in direction by the last week of the month. The change in conditions would signal the cessation of the Southwest Monsoon season and the start of the inter-monsoon period.

2         The inter-monsoon conditions are forecast to last through November 2018, and the period is characterised by warm weather and thunderstorms that can at times be intense. During the inter-monsoon months, lightning activity tends to be higher than other months of the year.

3         The second fortnight of October 2018 is not expected to be as wet as the first fortnight of the month. For the rest of the month, localised short-duration 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 five to seven days. On one or two days, widespread thundery showers accompanied with gusty winds can be expected over Singapore between predawn hours and early morning, arising from Sumatra squalls moving eastwards from the Strait of Malacca to the South China Sea. Overall, the rainfall for October 2018 is expected to be above normal over most parts of Singapore.

4         In the second half of October 2018, the daily temperatures on most days are forecast to range between 25°C and 33°C. Warm conditions with maximum day-time temperatures that could reach a high of around 35°C in the afternoon can be expected on a few days when there is little or no rainfall.

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 – 15 October 2018)

6         Southwest Monsoon conditions prevailed in the first fortnight of October 2018 with low level winds blowing mainly from the east-southeast or south-southwest.

7         For most days in the first week of the month, stable atmospheric conditions in the region brought dry and warm weather over Singapore and the surrounding region. In contrast, the region experienced rainy conditions in the second week of October 2018. The wet weather over Singapore and the surrounding region was due to the presence of persistent easterly winds bringing moisture from the Tropical Central Pacific Ocean to the southern Southeast Asia region between 6 and 14 October 2018. The total rainfall of 109.8mm recorded at Sentosa on 9 October 2018 was the highest daily rainfall recorded in the first fortnight of October 2018.

8         The daily temperature recorded in the first fortnight of October 2018 ranged between 22.5°C and 35.6°C. It was dry and warm on most days in the first week of the month, and the daily maximum temperature recorded that week was around 35°C on a few days. The highest daily maximum temperature of 35.6°C was recorded on 5 October 2018 at Marina Barrage. The rainy weather in the second week of October 2018 brought relatively cool conditions and some respite to the warm conditions experienced the week before. On 13 and 14 October 2018, with overcast skies and several spells of rain showers throughout the day, the daily maximum temperature recorded on both days fell to 30.1°C and 28.4°C respectively. The lowest daily minimum temperature recorded during the rainy period (6 – 14 October 2018) ranged between 22.5°C and 23.6°C. The lowest daily minimum temperature of 22.5°C was recorded around the Changi area on 12 October 2018.

9         Rainfall during the first fortnight of October 2018 was above normal across the island. Highest rainfall of 224.0 mm (170% above average) was recorded around the Sentosa area. Areas in the northeastern part of Singapore around Changi, Pasir Ris and Seletar received rainfall ranging from 162 mm to 198 mm (90 to 166% above the average). Areas around Ulu Pandan received the lowest rainfall of 99.6 mm (9% below the average).

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

Singapore, 1 October 2018 – The current Southwest Monsoon conditions with low level winds blowing from the southeast or south are expected to gradually weaken in the first fortnight of October 2018. In the second week of October, more showers are forecast for Singapore and the surrounding region. The showers are expected to bring some respite to the persisting dry and warm weather over Singapore since mid-September 2018.

2            During the fortnight, with weak winds and strong solar heating of land areas, Singapore can expect thundery showers mostly in the afternoon on six to eight days. Overall, the rainfall for the first fortnight of October 2018 is expected to be near-normal.

3          On most days in the fortnight, the daily temperature is forecast to range between 25°C and 33°C.  On a few days when there is little or no rainfall, warm 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 – 30 September 2018)

5         In September 2018, Southwest Monsoon conditions prevailed with the low level winds blowing mainly from the southeast or south.

6         During the month, Singapore experienced thundery showers mostly in the late morning and afternoon. In the first half of the month, the thundery showers that fell over the island were due to wind convergence over Singapore and the surrounding vicinity and to the passage of Sumatra squalls that crossed over Singapore from the Strait of Malacca to the South China Sea. The heaviest rainfall in September 2018 occurred on 7 September at Upper Thomson where the daily total rainfall recorded was 121.6mm. Compared to the first half of September, there was less rainfall in the second half of the month. The thundery showers that fell over the island in the afternoon on some days in the last two weeks of September were localised and of short-duration. The overall rainfall in September 2018 was near-normal.

7         The last two weeks of September 2018 was also warmer and drier than the first half of the month. The daily maximum temperature in the first fortnight of the month ranged between 30.1°C and 33.6°C. In the second fortnight of the month, with fair and warm conditions, the daily maximum temperature recorded was between 31.8°C and 35.2°C. The daily minimum temperature during the month ranged between 21.4°C and 27.3°C

8        Above-average rainfall was recorded over two-thirds of the island in September 2018. The lowest rainfall of 88.2 mm (54% below average) was recorded at Choa Chu Kang West. Rainfall was highest at the Thomson area where 289.8 mm (59% above average) was recorded.

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

2^nd half of Sept’18 to be less wet with fewer rain days than the first half of the month. Expect 4-6 days of thundery showers mostly in the late morning and early afternoon, and Sumatra squalls bringing widespread rain on 1 or 2 mornings.

Singapore, 14 September 2018 – The prevailing Southwest Monsoon conditions are forecast to persist for the rest of September 2018. The low level winds over Singapore during this period are expected to blow from the southeast or southwest.

2           The second fortnight of September 2018 is forecast to experience less wet weather and fewer rain days compared to the first half of the month. During the fortnight, thundery showers due to strong solar heating of land areas, are expected mostly in the late morning and early afternoon on four to six days. The showers could extend into the late afternoon on a few of these days. In addition, on one or two mornings, the passage of Sumatra squall could bring widespread thundery showers accompanied by gusty winds over Singapore as the squall moves east toward the South China Sea. Overall, the rainfall for September 2018 is expected to be near-normal.

3         The daily temperature range on most days of the fortnight is likely to be between 25°C and 33°C.  On a few days when there is 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 – 13 September 2018)

5         Southwest Monsoon conditions persisted over Singapore and the region in the first half of September 2018. During the fortnight, the low level winds over Singapore were blowing mainly from the southeast or south.

6         On most days in the first half of September 2018, the thundery showers fell over the island between the morning and early afternoon. The wet weather on these days were due to convergence of winds in the surrounding vicinity or to the eastward passage of Sumatra squalls from the Strait of Malacca to the South China Sea. In particular, the heavy rainfall over many parts of the island on 7 September, was due to a large-scale convergence of winds in the region. The daily total rainfall of 121.6mm recorded at the Upper Thomson area that day was the highest total rainfall in a day for the first fortnight of September 2018.

7         With wet weather conditions experienced on most days during the fortnight, the first half September 2018 was generally less warm compared to the last fortnight of August 2018. The daily maximum temperature in the first half of September 2018 ranged between 30.1°C and 33.7°C, and the daily minimum temperature was between 21.4°C or 26.4°C.  On 4 September, Singapore experienced a pleasant maximum temperature of only 28.7°C following the widespread rainfall in the morning as a result of the passage of a Sumatra squall over Singapore and the surrounding region.

8        Above-average rainfall was recorded over three quarters of the island in the first half of September 2018. The lowest rainfall of 32.4 mm (64% below average) was recorded at Choa Chu Kang West. Rainfall was highest at Katong where 182.0 mm (161% above average) was recorded.

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

More showers expected for first half of Aug 2018 arising from short-duration thundery showers mostly in the late morning and early afternoon, and from Sumatra squalls between the predawn and early morning.  A few warms days can be expected.

Singapore, 1 August 2018 – The prevailing Southwest Monsoon conditions in the region are forecast to persist in August 2018. For the first fortnight of the month, the low level winds are expected to blow mostly from the southeast or southwest, and may on brief occasions, shift to blow from the west.

2          In the first two weeks of August 2018, Singapore and the surrounding region can expect more rainfall compared to the last fortnight of July 2018. During the coming fortnight, short-duration thundery showers are forecast on five to seven days, with most of the showers occurring between the late morning and early afternoon. On some of these days, the showers could extend into the late afternoon. In addition, on two or three days, the passage of Sumatra squalls moving eastward across Singapore towards the South China Sea could bring widespread moderate to heavy thundery showers accompanied by gusty winds to the island between the predawn hours and early morning. The rainfall for the first fortnight of August 2018 is likely to be near average.

3          In the coming fortnight, the daily temperature is expected to range between 24°C and 33°C on most days.  On a few days with little or no rain, slightly warmer 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 July 2018)

5          Southwest Monsoon conditions persisted over the region in July 2018, and the low level winds were generally blowing from the southeast or southwest.

6          In July 2018, there were several days where Sumatra squalls brought widespread thundery showers with gusty winds over the island between the predawn hours and early morning. In addition, there were days where strong solar heating of land areas brought short-duration thundery showers over the island in the afternoon, which on one or two days extended into the evening. The moderate to heavy rain that fell over the northeastern part of Singapore in the late afternoon and evening on 7 July 2018 brought a total rainfall of 78.4mm, the highest daily total for July 2018.

7         On most days in July 2018, the highest daily maximum temperature was between 32°C and 33°C. The highest daily maximum temperature was 34.4°C recorded on 12 July 2018. The daily minimum temperature in July 2018 ranged between 23°C and 27°C.

8         Below normal rainfall was recorded island wide in July 2018. The lowest rainfall of 60 mm (67% below average) was recorded at Sentosa. Rainfall was highest at Ulu Pandan where 193.8 mm (2% below average) was recorded.

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

In 2015, MSS’ Centre for Climate Research Singapore (CCRS) completed the first phase of the Second National Climate Change Study, which provided climate projections up to 2100 for key variables such as temperature, rainfall, wind, and sea level rise. The Study’s findings form the basis for Singapore’s long-term climate change adaptation plans.

The Study’s methodology and findings were presented at the Special ASEAN Ministerial Meeting on Climate Action (SAMCA) held in Singapore on 10 July 2018. The presentation highlighted the complexities and challenges in generating climate scenarios and applying them to adaptation planning. It also touched on how better regional cooperation in data and knowledge exchange can overcome some of the challenges.

Dry and warm conditions to continue for rest of July 2018. Expect 3-5 days of short-duration thundery showers between late morning and early afternoon, and 1 or 2 days of widespread thundery showers between predawn and early morning.

Singapore, 16 July 2018 – The prevailing Southwest Monsoon conditions are forecast to persist in the second half of July 2018, and continue into September/early October 2018. During this period, the low level winds over Singapore and the surrounding region are expected to blow mostly from the southeast or southwest, and on brief occasions, to blow from the west.

2         The dry and warm weather conditions that were experienced over the southern parts of Southeast Asia, including Singapore in the first half of July 2018 are forecast to persist on most days for the rest of month. During the second fortnight of July 2018, the daily temperatures are expected to range between 24°C to 34°C. On days with little or no rain, the daily maximum temperature could reach a high of around 35°C.

3         In the next two weeks, short-duration thundery showers can still be expected on three to five days, mainly in the late morning and early afternoon. On one or two days during the period, the passage of a Sumatra squall from the Strait of Malacca to the South China Sea could bring widespread thundery showers and gusty winds over the island between the predawn hours and early morning. Overall, the rainfall for July 2018 is expected to be below normal over many 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, or the MSS’ Weather@SG app.

REVIEW (1 – 15 July 2018)

5       In the first half of July 2018, Southwest Monsoon conditions prevailed over the region with low level winds blowing predominantly from the southeast or southwest.

6         Compared to the last fortnight of June 2018, the first fortnight of July 2018 received less rainfall due to stable atmospheric conditions that prevailed over the southern Southeast Asia region. This brought dry and warm weather conditions on most days during the first half of July 2018. The thundery showers experienced over parts of the island in the first two weeks of the month were due to strong solar heating of land areas coupled with convergence of winds in the surrounding vicinity on some days, and to the passage of the Sumatra squalls over Singapore as it moved east towards the South China Sea on a few mornings. The highest daily total rainfall recorded in July 2018 was 78.4mm on 7 July 2018 around Punggol. Strong daytime heating of land areas on 7 July 2018 brought intense thundery showers over the northern and eastern parts of Singapore in the late afternoon and evening.

7         In the first fortnight of July 2018, the daily maximum temperatures ranged between 29°C and 33°C on most days. The highest daily maximum temperature recorded during the fortnight was 34.4°C on 12 July 2018. The daily minimum temperature was around 24°C but fell below 22°C on a few occasions during intense thunderstorms.

8         About two-thirds of Singapore received below normal rainfall in the first fortnight of July 2018. The lowest rainfall of 15.2 mm (84% below average) was recorded at Queenstown. Rainfall was highest at Changi where 124.2 mm (67% above average) was recorded.

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

Expect less wet weather in 1^st half of Jul ’18 compared to 2^nd half of Jun ‘18. Thundery showers are expected on 5-7 days between late morning and early afternoon, and 1-2 days between pre-dawn and early morning. A few warm days can be expected.

Singapore, 2 July 2018 – Southwest Monsoon conditions have been prevailing over Singapore and the surrounding region since June 2018. These conditions are forecast to persist in July 2018, with the low level winds blowing predominantly from the southeast or southwest. On a few days, the winds may shift to blow briefly from the west.

2         The first two weeks of July 2018 is not expected to be as wet as the last two weeks of June 2018. With less rainfall, generally warmer temperatures can be expected. On most days in the first half of July 2018, the daily temperature is forecast to range between 25°C and 34°C, and on a few of these days, the daily maximum temperature could reach a high of around 35°C.

3         In the first fortnight of July 2018, thundery showers due to strong solar heating of land areas are expected in the late morning and early afternoon on five to seven days. In addition, on one or two days between the predawn hours and early morning, the passage of a Sumatra squall from the Strait of Malacca towards the South China Sea is expected to bring thundery showers with occasional gusty winds over Singapore. Overall, the rainfall for the first fortnight of July 2018 is likely to be slightly below normal over most 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, or the MSS’ Weather@SG app.

REVIEW (1 – 30 June 2018)

5         In June 2018, Southwest Monsoon conditions prevailed over Singapore and the region, and the low level winds were predominantly blowing from the southeast or southwest. June 2018 was a relatively wet month with most of the showers occurring in the second half of June 2018 than the first half of the month.

6         In the first two weeks of June 2018, there were several dry and warm weather days due to stable atmospheric conditions over Singapore and the surrounding region. In the second fortnight of June 2018, winds converging over Singapore and the surrounding vicinity brought moderate to heavy thundery showers to the island in the morning and early afternoon on most days. In addition, the passage of Sumatra squalls on a few days brought widespread thundery showers with gusty winds to Singapore between the predawn hours and morning.

7         In June 2018, the rain was heaviest on 26 June 2018 where the highest daily total rainfall recorded was 179.8mm around the Toh Tuck area. In addition, this is the fifth highest rainfall ever recorded (based on any rainfall station on the island) for the month of June, and is also the highest daily rainfall recorded to date in 2018.

8         The daily temperature in June 2018 ranged between 21.5°C and 35.0°C. In the first half of June 2018, there were a few days that were dry and warm with daily maximum temperatures of above 34°C. The highest daily maximum temperature of 35.0°C was recorded at the Marina Barrage area on 6 June 2018. In the second half of June 2018, wetter weather brought relatively cooler temperatures to the island. During this period, there were 7 days where the daily maximum temperatures recorded were below 32.0°C, and 9 days where the daily minimum temperature fell below 23°C.

9          At the Changi climate station, the lowest daily maximum temperature recorded was 27.7°C on 27 June 2018, and the mean monthly daily maximum temperature recorded was 31.3°C, 0.7°C below the long-term mean for June.

10         Singapore received well above-normal rainfall in June 2018. The lowest rainfall of 151.0 mm (5% above average) was recorded at Admiralty. Rainfall was highest at Ulu Pandan (around the Toh Tuck area) where 648.2 mm (270% above average) was recorded.

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