First Half of August 2018 Forecast to be Wet

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 (, NEA website (, 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)

Mean daily maximum temperature 31.4 °C
Mean daily minimum temperature 25.0 °C
Mean monthly temperature 27.9 °C
Mean rainfall for the month 148.9 mm
Mean number of rain days 14
Highest monthly mean daily maximum temperature 32.6 °C (1997)
Lowest monthly mean daily minimum temperature 23.9 °C (1989)
Highest monthly rainfall 327.3 mm (2008)
Lowest monthly rainfall 45.1 mm (1994)