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Singapore, 16 July 2019 – The Southwest Monsoon conditions that have been prevailing over Singapore and the surrounding region since early June 2019 are forecast to continue for the rest of July 2019, and persist until October 2019. During this period, the low level winds are forecast to blow from the southeast or southwest.

2          In the second fortnight of July 2019, the monsoon rain band is forecast to lie over northern Southeast Asia and the northern South China Sea. This is expected to bring generally dry and occasionally windy conditions to Singapore and the surrounding region in the first week of the fortnight. Despite the drier conditions, there could still be a few days of localised short-duration showers at times with thunder over a few areas of the island in the late morning and early afternoon.

3          More rain can be expected in the later part of July 2019. Periods of widespread thundery showers, at times heavy can be expected on two or three days due to large scale wind convergence over Singapore and the surrounding region. In addition, there could be a few days of localised short-duration thundery showers in the late morning and early afternoon. Overall, the rainfall for July 2019 is likely to be slightly below normal.

4          In the second fortnight of July 2019, the daily temperature over Singapore is forecast to range between 25°C and 33°C. The daily maximum temperature could reach a high of around 34°C on some days. On some nights, warm and humid conditions with night-time temperatures of around 28°C are expected, in particular when prevailing winds blowing from the southeast bring 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 – 15 July 2019)

6          Southwest Monsoon conditions prevailed in the first fortnight of July 2019, and the low level winds were blowing mostly from the southeast or southwest.

7          During the first half of July 2019, Singapore experienced short-duration thundery showers in the late morning and afternoon due to strong solar heating of land areas and large-scale convergence of winds in the surrounding vicinity. Most of the showers fell in the first half of the fortnight. The thundery showers that fell over many areas of the island on 8 July 2019 recorded a daily total rainfall of 51.6mm at Mandai. This was the highest daily total rainfall for July 2019 (as of 15 July 2019).

8          There were several warm days in the first fortnight of July 2019. The daily maximum temperature ranged between 31.1°C and 34.5°C, with the highest daily maximum temperature of 34.5°C recorded at Pulau Ubin on 6 July 2019. There were also a few warm nights where the night-time temperature hovered around 28°C, especially over the southeastern part of the island. The warm nights were due to warm and humid air blown in from the sea by the prevailing southeasterly winds.

9          Below-average rainfall was recorded over many parts of the island in the first fortnight of July 2019. The lowest anomaly of 94% below-average was recorded at Changi.

CLIMATE STATION STATISTICS

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

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

Short-duration thundery showers and Sumatra squalls mostly in first half of coming fortnight; Dry and warm conditions in the 2^nd week of month with warm temperatures of up to 35°C expected on some days.

Singapore, 1 July 2019 – The prevailing Southwest Monsoon conditions are expected to persist over Singapore and the surrounding region in the first fortnight of July 2019. During the period, the low level winds are forecast to blow from the southeast or southwest.

2          For the fortnight, showers are forecast mostly in the first week of July 2019. Short-duration thundery showers in the late morning and early afternoon are expected on three to five days. On two or three days, Sumatra squalls moving over the island could bring widespread thundery showers and gusty winds in the morning. Overall, the rainfall for the first fortnight of July 2019 is likely to be near-normal across the island.

3          During the first half of the month, the monsoon rain band is forecast to gradually shift further north away from the Equator, and a transition to drier conditions in the region can be expected in the next few weeks. For Singapore, the showers in the first week are forecast to ease, and dry and warm weather are expected in the second week of the month.

4          The daily temperature on most days in the coming fortnight is forecast to range between 25°C and 34°C, and the daily maximum temperature could reach a high of 35°C on some days. On some nights, minimum night-time temperatures of around 28°C can be expected, especially when the prevailing winds blow from the southeast and 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 – 30 June 2019)

6         In June 2019, Southwest Monsoon conditions prevailed over Singapore and the surrounding region, and the low level wind blew from the southeast or southwest.

7          June 2019 was a relatively wet month. Thundery showers fell over the island mostly between the late morning and afternoon on more than three-quarters of the month. The wet weather was due to the presence of the monsoon rain band over the equatorial region, the large-scale wind convergence over the surrounding region and/or the passage of the Madden-Julian Oscillation (MJO). In particular, on 3 June 2019, the widespread thundery showers that fell in the late morning and early afternoon recorded a rainfall total of 102.8mm at Bukit Merah. On 21 June 2019, the localised moderate to heavy thundery showers that fell over the eastern part of Singapore recorded a daily rainfall total of 137.7mm (at Changi). This was the highest daily total rainfall recorded for June 2019.

8          The wet weather in June 2019 also brought slightly cooler days to Singapore compared to May 2019. The mean daily maximum temperature of 31.3°C in June 2019 was 0.7°C below the long term mean for June. The daily maximum temperature in June 2019 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, and at Paya Lebar on 20 June 2019. There were a few warm nights in June 2019 where the minimum night-time temperature was around 28°C. This was due to prevailing winds blowing from the southeast that brought in warm and humid air from the sea.

9          Well above-average rainfall was received across the island in the first fortnight of June 2019. The highest anomaly of 92% above-average was at Jurong West. The anomaly was lowest at Admiralty at 7% below-average.

CLIMATE STATION STATISTICS

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

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

Singapore, 31 May 2019 – In the first fortnight of June 2019, 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          The weather in the first fortnight of June 2019 is forecast to be just as wet as it was in the last fortnight of May 2019. With strong day-time heating of land areas, thundery showers are expected mostly in the late morning and early afternoon on six to eight days. On two to three days in the coming fortnight, Sumatra squalls moving from the Strait of Malacca to the South China Sea could track over Singapore and bring widespread thundery showers and occasional gusty winds in the morning. The overall rainfall for the first half of June 2019 is likely to be above-normal over most parts of Singapore.

3          The warm and humid conditions in May 2019 are forecast to persist into the first fortnight of June 2019. With the setting in of the Southwest Monsoon season, more warm and humid nights can be expected; warm nights typically occur when the prevailing winds blow from the southeast and brings warm, humid air from the sea over the land. The daily temperature on most days is forecast to range between 25°C and 33°C. Night-time minimum temperatures of up to 28°C can be expected on some 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 May 2019)

5          Inter-monsoon conditions prevailed in Singapore and the surrounding region in May 2019. During this period, the low level prevailing winds were generally light and variable in direction, and on occasions, blew from the east or southeast.

6          In May 2019, thundery showers due to convergence of winds over Singapore and the surrounding vicinity, fell in the late morning and afternoon on most days. On several days, particularly in the second week of the month, the passage of Sumatra squalls brought widespread thundery showers to Singapore between the predawn and early morning. The thundery showers were heaviest on 16 May 2019 where the highest daily rainfall total recorded was 119.8mm at Jurong Pier. A waterspout, associated with an intense Sumatra squall, was sighted over the sea area south of Tanjong Pagar on 11 May 2019.

7          May is climatologically one of the warmest months of the year. In May 2019, the highest daily maximum temperature across the island was at least 34°C on more than half the number of days of the month. The highest daily maximum temperature of 35.0°C was recorded at Paya Lebar and Clementi on 6 and 7 May 2019 respectively. The lowest daily minimum temperature of 20.8°C was recorded at East Coast Park around predawn when a squall moved over Singapore on 8 May 2019.

8          At the climate station in Changi, May 2019’s mean monthly temperature of 29.3°C (as of 30 May 2019) is on track to tie with that in May 1997 and 2016 as the second warmest May in Singapore since temperature records started in 1929. In addition, May 2019’s mean daily minimum temperature of 26.5°C is likely to tie the record high set in May 2003 and 2016.

9          Slightly less than half of Singapore received above-average rainfall in May 2019, with most of the rain falling over the southwestern part of Singapore. The highest rainfall of 366.8 mm (78% above average) was recorded at Jurong. Rainfall was lowest over the eastern part of Singapore at Changi where 68.6 mm (56% below average) of rain was recorded.

CLIMATE STATION STATISTICS

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

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

Singapore, 16 May 2019 – Inter-monsoon conditions that started in late March 2019 are expected to continue for the rest of May 2019. During this period, the low level winds are forecast to blow from the south or southeast.

2          In the second fortnight of May 2019, short-duration thundery showers are expected mostly between the late morning and early afternoon on six to eight days. On two to three days in particular in the first week of the coming fortnight, the occurrence of Sumatra squalls is forecast to bring widespread thundery showers accompanied by gusty winds between the predawn and morning. Overall, the rainfall for May 2019 is likely to be above-normal for many parts of Singapore.

3          The warm and humid conditions experienced during the first half of May 2019 are forecast to continue for the rest of May 2019.  The daily temperature on most days is expected to range between 26°C and 34°C, and on days with little or no rainfall, the daily maximum temperature could reach around 35°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 May 2019)

5          Inter-monsoon conditions prevailed over Singapore and the surrounding region in the first half of May 2019. The low level winds during the period were generally weak and variable in direction.

6          During the fortnight, the presence of the monsoon rain band near the equatorial region brought short-duration thundery showers over the island, mostly between the morning and early afternoon.  On a few of these days, the stormy weather was a result of the eastward passage of Sumatra squalls which brought widespread thunderstorms and gusty winds over Singapore between the predawn hours and morning. As a result of strong convergence of air streams in the region, two consecutive Sumatra squalls moved across Singapore on 8 May 2019 – one during the early hours and predawn, and another in the late morning. On that day, the highest daily total rainfall of 109.8 mm was recorded at Jurong West. Sumatra squalls moved across the island again on 10 and 11 May 2019. Gusty winds with speed up to 90km/h was recorded at Pasir Panjang on 10 May 2019, and a large waterspout was sighted over the sea area south of Tanjong Pagar on 11 May 2019.

7          Despite the wet weather in the first fortnight of May 2019, most days recorded maximum temperatures of 34.0°C or more. The highest daily maximum temperature of 35.0°C was recorded at Paya Lebar and Clementi on 6 and 7 May 2019 respectively. The lowest daily minimum temperature of 20.8°C was recorded at East Coast Park around predawn when the squall moved over Singapore on the 8 May 2019.

8          More than three quarters of Singapore received above average rainfall in the first fortnight of May 2019. Rainfall was lowest over the eastern part of Singapore at Changi where 40.2 mm (49% below average) of rain was recorded. The highest rainfall of 194.4 mm (89% above average) was recorded at Jurong.

CLIMATE STATION STATISTICS

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

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

Inter-monsoon conditions to persist in the next fortnight. Expect mostly short-duration afternoon thundery showers & 3-5 mornings of widespread showers with gusty winds. Expect warm conditions with daily max temperatures of 34°C or more.

Singapore, 30 April 2019 – Inter-monsoon conditions have been prevailing since late March 2019 and are forecast to continue into May 2019. During this period, more occurrences of thundery showers can be expected over Singapore and the surrounding region, and the low level winds are forecast to be light and variable in direction. Climatologically, May has one of the highest number of lightning days in the year; May is also one of the warmest months of the year.

2         In the first half of May 2019, strong solar heating of land areas during the day are expected to bring short-duration moderate to heavy thundery showers in the afternoon on four to six days. On a few of these days, the thundery showers could extend into the evening. In addition, on three or five days, particularly in the second week of the fortnight, Sumatra squalls could bring widespread thundery showers with gusty winds in the predawn and morning. Overall, the rainfall for the first half of May 2019 is likely to be near-normal over most parts of Singapore.

3         Warm conditions to continue into the fortnight. On most days, the daily temperature is forecast to range between 25°C and 34°C. On a few days, the heat can be sweltering as the daily maximum temperature could reach around the high end of the 35°C range when there is little or no 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 – 29 April 2019)

5         Inter-monsoon conditions with low level winds that were light and variable in direction prevailed over Singapore and the surrounding region in April 2019. During the month, the presence of the monsoon rain band over the equatorial region contributed to more thundery showers over Singapore and the surrounding region, compared to March 2019.

6         In April 2019, thundery showers fell over the island in the afternoon on most days, and extended into the evening on a few of these days. This was due to strong solar heating of land areas and light winds over Singapore and the surrounding vicinity. The eastward passage of Sumatra squalls on a few days brought widespread moderate to heavy thundery showers and gusty winds to Singapore in the predawn and early morning. In particular, on 26 April 2019, the Sumatra squall over Singapore between the late morning and afternoon recorded a daily total rainfall of 118.7mm at Changi. This was the highest rainfall recorded in a day in April 2019.

7         April 2019 was also particularly warm. More than half the month had daily maximum temperatures exceeding 34°C. The highest daily maximum temperature of 36.4°C was recorded at Paya Lebar on 17 April 2019. This is close to the highest ever recorded daily maximum temperature of 37°C (1983) for April since temperature records started in 1929.

8         More than two-thirds of Singapore received slightly below-normal rainfall in April 2019. Rainfall was lowest at Seletar where 143.2 mm (36% below average) of rain was recorded. The highest rainfall of 299.8 mm (53% above average) was recorded over the south-eastern part of the island at Tanjong Katong.

CLIMATE STATION STATISTICS

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

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

Expect 6-8 days of short-duration thundery showers between late morning and afternoon and Sumatra squalls on 1-2 mornings. Warm conditions expected. Daily max temp could rise around 35°C on a few days.

Singapore, 16 April 2019 – The prevailing inter-monsoon conditions in Singapore and the surrounding region are expected to persist through May 2019.

2         During the inter-monsoon period, the low level winds are generally light and variable in direction. There is also strong solar heating of land areas, and coupled with convergence of winds over Singapore and the surrounding vicinity, short-duration thundery showers accompanied by high lightning activity typically occur in the afternoons.

3         In the second half of April 2019, moderate to heavy short-duration thundery showers are expected between the late morning and afternoon on six to eight days. In addition, on one or two days, the passage of Sumatra squalls could bring widespread thundery showers and gusty winds in the morning. The rainfall for April 2019 is forecast to be near-normal.

4         Although thundery showers are expected on most days for the rest of April 2019, it is also expected to be warm. The daily temperature on most days is forecast to range between 25°C and 34°C. On a few afternoons, the daily maximum temperature could reach a high of 35°C.

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 April 2019)

6         During the first half of April 2019, inter-monsoon conditions prevailed over Singapore and the surrounding region. The low level winds were generally light and variable in direction, and the monsoon rain band was located over the equatorial region. This brought wet conditions over Singapore and the surrounding region, a welcome relief from the prolonged drier and hotter than usual conditions experienced on most days since late January 2019.

7         In the first half of April 2019, light winds and strong solar heating of land areas led to the development of thunderstorm clouds on most days. Intense short-duration thundery showers fell over many areas in the afternoon on some days. The thundery showers over the Tai Seng area in the late afternoon of 10 April 2019 recorded 71.4mm of rain. This was the highest total rainfall in a day for the first fortnight of April 2019.

8         On a few days in early April 2019, the winds blew from the southwest or west, and Sumatra squalls moved over Singapore in the predawn hours and early morning. This brought widespread thundery showers and gusty winds over many areas of the island. The wind gust of 75.6km/h at Pasir Panjang during the passage of a squall on 3 April 2019 was the highest recorded wind gust for April 2019 so far.

9         Despite the wet weather on most days in the first fortnight April 2019, there were several days that were very warm with the daily maximum temperature rising to above 35°C. During the period, the highest daily maximum temperature recorded was 36.0°C at Admiralty on 7 April 2019.  On most days, the daily temperature ranged between 24°C and 34°C.

10         More than two-thirds of the island received below-normal rainfall in the first fortnight of April 2019. The highest rainfall of 168.4 mm (67% above average) was recorded at Tanjong Katong. Rainfall was lowest at Choa Chu Kang where 52.6 mm (59% 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)