Expect less wet weather in 1st half of Jul ’18 compared to 2nd half of Jun ‘18. Thundery showers are expected on 5-7 days between late morning and early afternoon, and 1-2 days between pre-dawn and early morning. A few warm days can be expected.
Singapore, 2 July 2018 – Southwest Monsoon conditions have been prevailing over Singapore and the surrounding region since June 2018. These conditions are forecast to persist in July 2018, with the low level winds blowing predominantly from the southeast or southwest. On a few days, the winds may shift to blow briefly from the west.
2 The first two weeks of July 2018 is not expected to be as wet as the last two weeks of June 2018. With less rainfall, generally warmer temperatures can be expected. On most days in the first half of July 2018, the daily temperature is forecast to range between 25°C and 34°C, and on a few of these days, the daily maximum temperature could reach a high of around 35°C.
3 In the first fortnight of July 2018, thundery showers due to strong solar heating of land areas are expected in the late morning and early afternoon on five to seven days. In addition, on one or two days between the predawn hours and early morning, the passage of a Sumatra squall from the Strait of Malacca towards the South China Sea is expected to bring thundery showers with occasional gusty winds over Singapore. Overall, the rainfall for the first fortnight of July 2018 is likely to be slightly below normal over most parts of Singapore.
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 – 30 June 2018)
5 In June 2018, Southwest Monsoon conditions prevailed over Singapore and the region, and the low level winds were predominantly blowing from the southeast or southwest. June 2018 was a relatively wet month with most of the showers occurring in the second half of June 2018 than the first half of the month.
6 In the first two weeks of June 2018, there were several dry and warm weather days due to stable atmospheric conditions over Singapore and the surrounding region. In the second fortnight of June 2018, winds converging over Singapore and the surrounding vicinity brought moderate to heavy thundery showers to the island in the morning and early afternoon on most days. In addition, the passage of Sumatra squalls on a few days brought widespread thundery showers with gusty winds to Singapore between the predawn hours and morning.
7 In June 2018, the rain was heaviest on 26 June 2018 where the highest daily total rainfall recorded was 179.8mm around the Toh Tuck area. In addition, this is the fifth highest rainfall ever recorded (based on any rainfall station on the island) for the month of June, and is also the highest daily rainfall recorded to date in 2018.
8 The daily temperature in June 2018 ranged between 21.5°C and 35.0°C. In the first half of June 2018, there were a few days that were dry and warm with daily maximum temperatures of above 34°C. The highest daily maximum temperature of 35.0°C was recorded at the Marina Barrage area on 6 June 2018. In the second half of June 2018, wetter weather brought relatively cooler temperatures to the island. During this period, there were 7 days where the daily maximum temperatures recorded were below 32.0°C, and 9 days where the daily minimum temperature fell below 23°C.
9 At the Changi climate station, the lowest daily maximum temperature recorded was 27.7°C on 27 June 2018, and the mean monthly daily maximum temperature recorded was 31.3°C, 0.7°C below the long-term mean for June.
10 Singapore received well above-normal rainfall in June 2018. The lowest rainfall of 151.0 mm (5% above average) was recorded at Admiralty. Rainfall was highest at Ulu Pandan (around the Toh Tuck area) where 648.2 mm (270% above 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) |