- Monsoon Update
(Updated on 7 June 2019)
The Southwest Monsoon season arrived in early June 2019 and typically prevails over the region until September/early October. The season is usually associated with the traditional dry (rainy) season of the southern (northern) ASEAN region, with the prevailing winds blowing predominantly from the southeast or southwest.
During the season, the presence of tropical cyclones in the Western Pacific Ocean and South China Sea could bring heavy rainfall over parts of the northern ASEAN region, mostly over the Philippines and Vietnam. In the southern ASEAN region, extended periods of drier weather can be expected, and this could lead to an escalation in hotspot activities, and possibly occurrence of transboundary haze.
In the first half of June 2019, Singapore is forecast to receive above-normal rainfall over most parts of the island. arising from short-duration thundery showers that are forecast mostly in the late morning and early afternoon on most days, and widespread thundery showers and occasional gusty winds from Sumatra squalls on a few mornings Towards the second half of June 2019, drier weather can be expected over Singapore and the surrounding region as prevailing winds strengthen and blow from the southeast or southwest and as the monsoon rain band shifts further north toward northern Southeast Asia. Overall, Singapore is likely to receive near-normal rainfall for June 2019.
In July and August 2019, while short-duration thundery showers can be expected mostly in the late morning and early afternoon due to strong day-time heating of land areas, and thundery showers between the predawn and early morning on some mornings from Sumatra squalls, there is still a high probability of drier than normal conditions over Singapore during these months.
The season also brings warm and humid nights over Singapore. Warm nights typically occur when the prevailing winds blow from the southeast and brings warm, humid air from the sea over the land. Night-time minimum temperatures of up to 28°C can be expected on some days. Between June and September, the daily maximum temperature in Singapore could reach a high of around 35°C. On other days, the daily temperature is forecast to range between 25°C and 34°C.
Furthermore, Singapore can occasionally experience slightly hazy conditions on a few days, in particular in the early morning due to the accumulation of particulate matter under light wind conditions.
For June, July, August 2019, well-below normal rainfall and well-above normal temperatures are predicted over Singapore and the surrounding equatorial Southeast Asia region.
The long-term rainfall and temperature statistics* for June, July and August at our climate station are shown in Table 1.
|Average Monthly Rainfall Total (mm)||130.7||154.4||148.9|
|Average number of rain days (Days with 0.2mm or more of rainfall)||12||14||14|
|Average Daily Maximum Temperature (°C)||32.0||31.3||31.4|
|Average Daily Minimum Temperature (°C)||25.4||25.0||25.0|
Table 1: Long-term rainfall and temperature statistics for June, July and August
For the latest weather forecast, including heavy rain warnings, please visit our MSS website (www.weather.gov.sg), NEA website (www.nea.gov.sg), download the myENV app., Weather@SG app, weather information hotline at 65427788, through following NEA’s twitter via @NEAsg or from radio broadcasts.
*based on 30-yr climatological reference period (1981- 2010)