Singapore's Southwest Monsoon season has arrived in early June 2025, bringing warm humid nights, thundery showers, and gusty winds.
KEY POINTS
IN SIMPLE TERMS
Singapore is entering its monsoon season starting in June, which means hotter and more humid nights, sudden rainstorms, and stronger winds. Daytime temperatures may reach 34–35°C, and nights will stay warm above 29°C. Rain is expected to be about average for the month.
WHY IT MATTERS
WHERE DO YOU STAND?
Do you find warm and humid nights during the Southwest Monsoon season difficult for sleeping?
👍 👎 Vote ↓Singapore enters the Southwest Monsoon season this June, bringing short-duration thundery showers and warmer, humid nights as temperatures remain high.
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.
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.
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.
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 | – |
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.
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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