Singapore weather in September 2025

Expect daytime maximum temperatures of 30°C in Singapore in September and very high heat and humidity based on long-term weather averages. There are 5 hours of sunshine per day on average with 15 days with some rainfall and typically 172 mm of rainfall in the month.

  • 30°C maximum daytime temperature in September in Singapore30
    30°C max day temperature
  • 5 hours of sunshine per day
  • 15 days with some rainfall in September in Singapore15
    15 days with some rainfall
  • 23°C minimum night-time temperature in September in Singapore23
    23°C min night temperature
  • 12 hours of daylight per day in September in Singapore12
    12 hours of daylight per day
  • Very high heat & humidity in September in SingaporeVH
    Very High heat & humidity
  • 172 mm monthly rainfall in September in Singapore172
    172 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Singapore11
    11+ (Extreme) UV index
  • 29°C sea temperature in September in Singapore29
    29°C sea temperature

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The September weather guide for Singapore shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Singapore

How hot is it in Singapore in September?

Daytime temperatures usually reach 30°C in Singapore in September with very high heat and humidity, falling to 23°C at night.

How sunny is it in Singapore in September?

There are normally 5 hours of bright sunshine each day in Singapore in September - that's 44% of daylight hours.

How warm is the sea around Singapore in September?

The average sea temperature around Singapore in September is 29°C.

Does it rain in Singapore in September?

There are usually 15 days with some rain in Singapore in September and the average monthly rainfall is 172mm.

Singapore September sunrise & sunset times

Browse the sunrise and sunset times for Singapore in September 2025. Select a month to view Singapore sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 07:01 19:09
Monday, 15th September 2025 06:56 19:03
Tuesday, 30th September 2025 06:52 18:58

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