- Southwest monsoon begins in Singapore, bringing warm and humid nights.
- Localised thundery showers and gutsy (strong) winds expected in early June 2025.
- Rainfall forecast for early June 2025 expected to be near average over most parts of the island.
Singapore enters the Southwest Monsoon season this June, bringing short-duration thundery showers and warmer, humid nights as temperatures remain high.
Weather Forecast for Early June 2025
In a press release by NEA, the Southwest Monsoon season has started in Singapore.
As of 2 June 2025, winds are expected to strengthen, coming from the southeast or southwest.
The Southwest Monsoon usually lasts until September and is known as the drier season of the year.
However, the first fortnight of June will see short periods of thundery showers over parts of the island.
Showers will mostly happen during the late morning and afternoon on some days.
- Sumatra squalls may affect the island during pre-dawn and morning hours.
- These squalls bring widespread thundery showers and strong, sudden winds.
- Total rainfall in the first half of June is expected to be near average across most areas.
- Daily maximum temperatures are likely to hit 34 degrees Celsius on most days and may reach 35 degrees Celsius on a few days.
- Nights will be warm and humid, with temperatures staying above 29 degrees Celsius on several nights.
How Does the Southwest Monsoon Affect Singapore?
The Southwest Monsoon has set in over Singapore in early June 2025.
This season usually brings drier weather but can also cause localised heavy rain in short bursts.
Gusty (strong) winds and thundery showers are common, especially when Sumatra squalls pass over the island.
Residents will notice warmer and more humid nights during this period.
Daytime heat can be intense, with the temperature sometimes rising to 35 degrees Celsius.
- Thundery showers may occur in short bursts.
- Gusty winds may be felt during squalls, especially in the early mornings.
- Humidity levels stay high at night, making it feel warmer.
Review of the Second Half of May 2025
As mentioned by NEA, Singapore had inter-monsoon conditions from 16 to 31 May 2025.
Winds during this period were light and changed direction often.
Localised thundery showers fell over some areas on several days.
On 18 May 2025, a Sumatra squall led to wide thundery showers across Singapore in the late morning and early afternoon.
The highest daily rainfall was 78.6mm, recorded at Sembawang on that day.
- Several days saw the temperature go above 35 degrees Celsius.
- The highest daily maximum was 36.2 degrees Celsius at Paya Lebar on 24 May 2025.
- Total rainfall was below average for the period, with Simei seeing about 63 per cent below average rainfall.
According to NEA, this period was warm with below average rainfall, indicating drier than usual conditions.
| Date | Location | Temperature (°C) | Rainfall (mm) |
|---|---|---|---|
| 18 May 2025 | Sembawang | – | 78.6 |
| 24 May 2025 | Paya Lebar | 36.2 | – |
Long-Term Climate Statistics for June
NEA provided long-term climate figures from the period 1991-2020 for comparison.
The average daily maximum temperature for June is 31.9 degrees Celsius.
The average daily minimum temperature is 25.7 degrees Celsius.
Average monthly temperature sits at 28.5 degrees Celsius.
The rainfall average for June is 135.3mm with 13 rain days on average.
Historical Climate Extremes for June
Singapore has a long record of rainfall and temperature statistics for June.
Rainfall records go back to 1869, while temperature records have been kept since 1929.
The highest monthly mean daily maximum temperature for June was 33.2 degrees Celsius in 1997.
The lowest monthly mean daily minimum temperature was 23.2 degrees Celsius in 1965.
The wettest June happened in 1954, with 378.7mm of rain, and the driest in 2009, with only 21.8mm.
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