Forecast
MONSOON UPDATE
The Northeast Monsoon gradually came to an end in the first week of April 2025.
During the inter-monsoon months of April and May, the prevailing winds over Singapore and the surrounding region are generally light and variable in direction. With the monsoon rain band usually lying near the equatorial Southeast Asia region, more occurrences of thunderstorms can be expected. Thunderstorm and lightning activity tend to be more intense during these months than during the Northeast and Southwest Monsoon seasons.
Strong solar heating of land areas and light wind conditions are favourable for the development of localised moderate to heavy thunderstorms in the afternoon. On occasions, with strong convergence of winds in the surrounding vicinity, the thundery showers could extend into the evening. On some days, the presence of low-pressure systems in the nearby seas could trigger Sumatra squalls which bring widespread thundery showers and gusty winds to Singapore between the predawn hours and morning, as the squalls move eastward towards the South China Sea. Overall, the total rainfall for April – May 2025 is forecast to be below to near average.
Climatologically, April and May are the warmest months of the year. For April – May 2025, the daily maximum temperature in Singapore may reach around 35 degrees Celsius on some days. On most days, the daily temperature is forecast to range between 24 degrees Celsius and 34 degrees Celsius. The temperatures for the April – May 2025 period are predicted to be above average.
Towards late May or early June 2025, Southwest Monsoon conditions are expected to gradually set in, with the winds increasingly blowing from the southeast or southwest.
The long-term rainfall and temperature statistics* for April and May at our Changi climate station are shown in Table 1.
| April | May | |
| Average Monthly Rainfall Total (mm) | 164.3 | 164.3 |
| Average number of rain days (Days with 0.2mm or more of rainfall) | 15 | 15 |
| Average Daily Maximum Temperature (°C) | 32.4 | 32.3 |
| Average Daily Minimum Temperature (°C) | 25.3 | 25.7 |
Table 1: Long-term rainfall and temperature statistics for April to 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) or download the myENV app.
*based on 30-yr climatological reference period (1991-2020)
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