Short-duration thundery showers on some days
Singapore, 17 July 2017 – In the second half of July 2017, the weather in Singapore will continue to be influenced by the prevailing Southwest Monsoon, and the low level winds during the period are forecast to blow mostly from the southeast or southwest.
2 For the rest of the month, Singapore can expect four to six days of short-duration thundery showers, mostly in the afternoon, due to strong solar heating of land areas. On one or two days between the predawn and morning, the passage of a Sumatra squall could bring widespread thundery showers with occasional gusty winds to Singapore. The rainfall for July 2017 is forecast to be normal.
3 Compared to the wet weather experienced in the first half of July 2017, the second fortnight of the month is expected to be generally dry and warm. On most days in the second half of July 2017, the daily maximum temperatures are forecast to range between 32°C and 33°C, and could reach a high of around 34°C on a few days.
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: 1 – 16 July 2017
5 Southwest Monsoon conditions prevailed over Singapore and the region in the first fortnight of July 2017. During this period, the low level winds were blowing predominantly from the southeast or southwest.
6 In the first half of July 2017, Singapore experienced moderate to heavy thundery showers on most days between the late morning and early afternoon. The showers were due to strong solar heating of land areas coupled with convergence of winds over Singapore and the immediate surrounding vicinity. The wet weather in the first fortnight of the month was also due to the passage of Sumatra squalls which brought widespread thundery showers with gusty winds to Singapore on some days between the predawn hours and early morning. During the period, the rain was heaviest on 14 July 2017 in Bukit Timah, where the highest daily rainfall total recorded was 110.6mm.
7 The wet weather in the first fortnight of July 2017 brought several days with cool night time temperatures. The daily minimum temperatures recorded ranged between 22.3°C and 24°C on 10 days. The lowest daily minimum temperature of 22.3°C was recorded around the Marina South area on 12 July 2017. The daily maximum temperature recorded during the fortnight ranged between 28.7°C and 33.7°C.
8 Most parts of Singapore received above normal rainfall in the first fortnight of July 2017. The highest rainfall of 168.4mm (92% above average) was recorded around the Paya Lebar area. Rainfall was lowest around the Changi area where 77.2mm (3% below average) was recorded.
CLIMATE STATION STATISTICS FOR JULY (Climatological reference period: 1981 – 2010)
| Mean daily maximum temperature | 31.3 °C |
| Mean daily minimum temperature | 25.0 °C |
| Mean monthly temperature | 27.9 °C |
| Mean rainfall for the month | 154.4 mm |
| Mean number of rain days | 14 |
| Highest monthly mean daily maximum temperature | 32.4 °C (1997) |
| Lowest monthly mean daily minimum temperature | 23.8 °C (1981) |
| Highest monthly rainfall | 305.4 mm (1988) |
| Lowest monthly rainfall | 18.6 mm (1997) |