Second half of Jun 2018 to be wetter than the first half of month. Expect mostly short-duration thundery showers (late morning-early afternoon) and few days of widespread showers with gusty winds (predawn hours-morning). A few warm days can also be expected.
Singapore, 14 June 2018 – Southwest Monsoon conditions have set in over Singapore and the surrounding region. These conditions are forecast to prevail for the rest of the month and extend into September 2018. During this season, the low level winds over Singapore and the surrounding region are expected to blow from the southeast or southwest.
2 For the coming fortnight, short-duration thundery showers are expected on five to seven days, mostly in the late morning and afternoon. On two or three days, widespread thundery showers accompanied with occasional gusty winds can be expected between the predawn hours and morning. Compared to the first half of June 2018, the second half of the month is expected to be wetter, and the overall rainfall for June 2018 is likely to be above average over most parts of Singapore.
3 Despite the wetter weather conditions forecast in the next fortnight, warm days can still be expected where the daily maximum temperature on a few days could reach a high of around 35°C. On most days, the daily temperature is forecast to range between 25°C and 34°C. The nights can be relatively warm, in particular on non-rain days. The warm days and nights typically occur when the southeast winds are light and bring warm, humid air from the sea toward the land.
4 For updates of the daily weather forecast, please visit the MSS website (www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app, MSS’ Weather@SG app.
REVIEW (1 – 13 June 2018)
5 Southwest monsoon conditions prevailed over Singapore and the surrounding region since early June 2018, and the low level winds blew predominantly from the southeast or southwest.
6 In the first fortnight of June 2018, the occurrence of Sumatra squalls on two consecutive days (on 1 and 2 June 2018) brought widespread thundery showers accompanied by gusty winds over Singapore between predawn hours and the early morning. The thundery showers were heaviest on 2 June 2018 where the highest recorded daily rainfall total was 92.2mm around the Jurong East area. The wet weather experienced on the first few days of the month was followed by several days of dry and warm weather conditions due to stable atmospheric conditions over Singapore and the surrounding region.
7 In the first week of June 2018, there were several days when the daily maximum temperature recorded was above 34°C. The highest temperature recorded in the first half of June 2018 was 35.0°C at the Marina Barrage area on 6 June 2018. At the Changi climate station, the night time temperatures on most days ranged between 26.0°C and 28.3°C, well-above the long-term climatological June mean minimum temperature of 25.4°C. The warm nights experienced were due to warm and humid air over the sea being blown towards land by the prevailing winds. The mean temperature recorded at the Changi climate station in the first half of June 2018 was 29.3°C, 1.0°C warmer than the long-term mean temperature for June.
8 Most parts of Singapore received above-normal rainfall in June 2018. The lowest rainfall of 25 mm (5% below average) was recorded at Admiralty. Rainfall was highest around Clementi where 192.8 mm (160% above average) was recorded.
CLIMATE STATION STATISTICS FOR JUNE (Climatological reference period: 1981 – 2010)
| Mean daily maximum temperature | 32 °C |
| Mean daily minimum temperature | 25.4 °C |
| Mean monthly temperature | 28.3 °C |
| Mean rainfall for the month | 130.7 mm |
| Mean number of rain days | 12 |
| Highest monthly mean daily maximum temperature | 33.2 °C (1991) |
| Lowest monthly mean daily minimum temperature | 24.4 °C (1989) |
| Highest monthly rainfall | 265.8 mm (1996) |
| Lowest monthly rainfall | 21.8 mm (2009) |