Gradual easing of dry and warm conditions with increased showers forecast in 2nd fortnight of Aug’18. Expect 5-7 days of late morning and early afternoon thundery showers, and 2 or 3 days of morning Sumatra squalls. A few warm days can still be expected.
Singapore, 16 August 2018 – The prevailing Southwest Monsoon conditions over Singapore and the region are forecast to persist for the rest of August 2018. In the next fortnight, the prevailing winds are forecast to blow from the southeast or southwest.
2 The dry and warm conditions experienced in recent days are expected to ease with a gradual increase in shower activities in the second half of August 2018. During the fortnight, short-duration thundery showers are forecast on five to seven days, with most of the rain falling between the late morning and early afternoon, and may on one or two days extend into the late afternoon. On two or three days, widespread moderate to heavy thundery showers accompanied by gusty winds due to Sumatra squalls can be expected in the morning. The rainfall for the August 2018 is likely to be below average for many parts of Singapore.
3 During the fortnight, the daily temperature is forecast to range between 25°C and 33°C on most days. Warmer conditions with maximum temperatures of around 34°C and minimum temperatures of around 27°C can be expected on a few days with little or no rain.
4 For updates of the daily weather forecast, please visit our MSS website (www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app, or the MSS’ Weather@SG app.
REVIEW (16 – 31 August 2018)
5 Southwest Monsoon conditions prevailed over Singapore and the surrounding region in the first fortnight of August 2018, and the low level winds during the period were predominantly from the southeast or southwest.
6 In the first fortnight of August 2018, most of the days were generally dry. Showers fell over the island on a few days during the period. The highest daily total rainfall of 66.7mm was recorded on 4 August 2018 at Changi, when heavy thundery showers fell over the northern and eastern parts of the island between the late afternoon and evening.
7 On most days in the first fortnight of August 2018, the highest daily maximum temperature was between 31°C and 33°C. In particular, between 11 and 15 August 2018, the weather was generally warm with the highest daily maximum temperature ranging between 34.0°C and 34.5°C. The warm conditions were due to dry weather coupled with strong solar heating. The daily minimum temperature in the first two weeks of August 2018 was mostly between 23.9°C and 27.9°C.
8 Well-below normal rainfall was recorded across the island in the first fortnight of August 2018. The lowest rainfall of 4 mm (96% below average) was recorded at Choa Chu Kang West. Rainfall was highest at Changi where 40.4 mm (45% 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) |