Singapore weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Fair
Best time to visit: January – February
What is the weather like in Singapore in September?
In September, Singapore is hot: daytime highs average 28 °C, and even at night it stays warm at around 26 °C. The sea averages 29.4 °C – almost as warm as a bath. Expect around 5 hours of sunshine a day. It is the rainy season: rain falls on about 24 days, totalling 186 mm. The air is often humid and muggy. All in all, September is a so-so month for a holiday in Singapore.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 53 | 50 | 48 |
| Day | 28° | 28° | 28° |
| Night | 26° | 26° | 26° |
| Sea | 29° | 29° | 30° |
| Sun | 6 h | 5 h | 5 h |
| Rain days | 25 | 24 | 26 |
More details for September
- Daylight
- 12 h 7 min06:56 – 19:04
- UV index
- 14 · extremeclear sky, noon (estimate)All months
- Muggy days
- 30 daysdew point 18 °C or more
- Wind
- 14 km/haverage daily peak
- Cloud cover
- 80 %on average
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+8Asia/Singapore
How the score comes together
- Temperatureweight 50 %84 %
- Sunshineweight 20 %40 %
- Few rainy daysweight 30 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
Singapore in September: quick answers
Is Singapore hot in September?
Yes. In September, Singapore is hot: daytime highs average 28 °C and nights stay around 26 °C.
Can you swim in Singapore in September?
Yes. In September the sea averages 29.4 °C – almost as warm as a bath.
Does it rain much in Singapore in September?
It rains often – on about 24 days, adding up to 186 mm.
Singapore month by month
The whole year in SingaporeAll destinations: SingaporeWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)