- Monsoon Update
(Updated on 7 December 2021)
In early December 2021, the winds increasingly strengthened and shifted to blow from the northeast or northwest as the Northeast Monsoon season set in over the region.
The Northeast Monsoon season is currently in its wet phase with rainy and occasionally windy conditions expected to extend into January 2022. During this period, thundery showers are expected in the afternoon and evening, due to a confluence of winds over Singapore and the surrounding vicinity. During the season, there may also be several monsoon surges that bring prolonged and widespread rainfall over Singapore and the surrounding region. A monsoon surge is associated with the intensification of high-pressure systems over northern Asia, and typically results in a strong outflow (or surge) of cold air over the South China Sea towards the Equator. Each surge event usually lasts between 2 – 3 days, and can bring strong north-easterly winds, as well as cool and continuous rainy weather over Singapore and the surrounding region.
During the wet phase of the season, daily temperatures in Singapore can range between 23°C and 33°C on most days. Cooler weather with lows of 22°C can be expected on rainy and cloudy days.
The Northeast Monsoon typically enters the dry phase around late January/ early February as the monsoon rain band shifts further south of the Equator. The dry phase is likely to extend into March 2022, during which there may be fewer rain days and less cloudy conditions over Singapore. Fair and warm weather, with occasionally windy conditions can be expected on most days, with daily maximum temperatures reaching up to 34 – 35°C on some days. Strong solar heating of land areas may trigger the development of sea breeze, resulting in convergence of winds over the island and thundery showers over Singapore on some days.
The prevailing weak to moderate La Niña will likely last to March 2022. Singapore can expect an increased chance of wetter conditions during the dry phase of the Northeast Monsoon season.
Overall, rainfall and temperature in Singapore for December-January-February is expected to be near-to-slightly above-normal.
The long-term rainfall and temperature statistics* for December to March at our climate station are shown in Table 1.
|Average Monthly Rainfall Total (mm)||331.9||221.6||105.1||151.7|
|Average number of rain days (Days with 0.2mm or more of rainfall)||19||13||9||12|
|Average Daily Maximum Temperature (°C)||30.5||30.6||31.5||32.2|
|Average Daily Minimum Temperature (°C)||24.3||24.3||24.6||24.9|
Table 1: Long-term rainfall and temperature statistics for December-March
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 information hotline at 65427788 or through following NEA’s twitter via @NEAsg or from radio broadcasts.
*based on 30-yr climatological reference period (1991-2020)