- Monsoon Update
(Updated on 5 April 2019)
The Northeast Monsoon season ended around end March 2019 and the inter-monsoon period has set in. The prevailing winds over Singapore and the surrounding region have become light and variable in direction and are expected to persist through May 2019. During the inter-monsoon months of April and May, the monsoon rain band lies near the equatorial region and more occurrences of thunderstorms can be expected. Thunderstorms tend to be more intense during these months and the accompanying lightning activity typically higher than during the Northeast and Southwest Monsoon seasons.
Compared to the first quarter of 2019 which was drier and warmer than usual and with significantly below-normal rainfall, more thundery showers can be expected for April and May 2019. Despite more rainfall expected in the inter-monsoon month, warm days with daily maximum temperature around 34°C can be expected on most days, and could reach slightly over 35°C on some days. The strong daytime heating of land areas coupled with convergence of winds over Singapore and the surrounding vicinity are conducive for the development of thunderstorm clouds in the afternoon.
In April and May 2019, moderate to heavy thundery showers in the afternoon are expected over Singapore on most days, and the showers could extend into the evening on a few of these days. Occasionally, presence of low pressure systems in the nearby seas could trigger the eastward passage of Sumatra squalls from Sumatra or the Strait of Malacca and bring widespread thundery showers accompanied with gusty winds to Singapore between the predawn hours and morning.
For April and May 2019, near-normal rainfall and above-normal temperatures are favoured over Singapore and the surrounding equatorial Southeast Asia region.
Towards end May 2019/early June 2019, inter-monsoon conditions are expected to gradually transition to Southwest Monsoon conditions, as the light and variable winds turn to blow from the southeast or southwest.
The long-term rainfall and temperature statistics* for April and May at our climate station are shown in Table 1.
|Average Monthly Rainfall Total (mm)||154.8||171.2|
|Average number of rain days (Days with 0.2mm or more of rainfall)||14||14|
|Average Daily Maximum Temperature (°C)||32.3||32.2|
|Average Daily Minimum Temperature (°C)||25.0||25.4|
Table 1: Long-term rainfall and temperature statistics for April and May
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)