More Showers Expected for First Half of September 2017

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 (, NEA website (, 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)

Mean daily maximum temperature 31.4 °C
Mean daily minimum temperature 24.8 °C
Mean monthly temperature 27.6 °C
Mean rainfall for the month 156.5 mm
Mean number of rain days 13
Highest monthly mean daily maximum temperature 32.2 °C (1997)
Lowest monthly mean daily minimum temperature 23.6 °C (1986)
Highest monthly rainfall 440.4 mm (1988)
Lowest monthly rainfall 23.7 mm (1994)