Singapore, 1 October 2025 – The Southwest Monsoon is coming to an end and inter-monsoon conditions are expected to set in during the first week of October 2025. The inter-monsoon period is characterised by light and variable winds, as well as higher lightning activity.
2 In the first fortnight of October of 2025, thundery showers are expected over parts of the island in the late morning and afternoon on most days. In addition, Sumatra squalls may bring widespread thundery showers and gusty winds on one or two mornings. The total rainfall for the first fortnight of October 2025 is forecast to be near average over most parts of the island.
3 The daily maximum temperatures are likely to range between 32 degrees Celsius and 34 degrees Celsius on most days and slightly exceed 34 degrees Celsius on a few days.
4 For updates of the daily weather forecast, please visit the MSS website (https://www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app.
REVIEW OF THE PAST TWO WEEKS (16 – 30 SEPTEMBER 2025)
5 Southwest Monsoon conditions prevailed over Singapore and the surrounding region in the second fortnight of September 2025, with winds blowing mostly from the southeast or southwest.
6 In the second fortnight of September 2025, localised short-duration thundery showers fell over parts of the island on several days. On 28 September 2025, regional convergence of winds brought moderate to heavy thundery showers over many areas of Singapore in the afternoon and evening. The daily total rainfall of 59.4 mm recorded at Pasir Ris that day was the highest rainfall recorded for the second fortnight of September 2025.
7 The daily maximum temperatures in the second fortnight of September 2025 were above 33 degrees Celsius on most days. The highest daily maximum temperature of 34.6 degree Celsius was recorded at Pulau Ubin on 23 September 2025 and at Admiralty on 27 September 2025.
8 Singapore recorded well below average rainfall in the second fortnight of September 2025. Jurong West registered rainfall of about 94 per cent below average.
CLIMATE STATION STATISTICS
Long-term Statistics for October
(Climatological reference period: 1991 – 2020)
| Average daily maximum temperature: | 31.8 °C |
| Average daily minimum temperature: | 25.0 °C |
| Average monthly temperature: | 27.9 °C |
| Average rainfall: | 168.3 mm |
| Average number of rain days: | 15 |
Historical Extremes for October
(Rainfall since 1869 and temperature since 1929)
| Highest monthly mean daily maximum temperature: | 33.0 °C (2002) |
| Lowest monthly mean daily minimum temperature: | 22.8 °C (1964) |
| Highest monthly rainfall ever recorded: | 497.1 mm (1947) |
| Lowest monthly rainfall ever recorded: | 10.8 mm (2002) |