Brunei weather in September 2025

Expect daytime maximum temperatures of 32°C in Brunei in September and very high heat and humidity based on long-term weather averages. There are 6 hours of sunshine per day on average with 21 days with some rainfall and typically 307 mm of rainfall in the month.

  • 32°C maximum daytime temperature in September in Brunei (Bandar Seri Begawan)32
    32°C max day temperature
  • 6 hours of sunshine per day
  • 21 days with some rainfall in September in Brunei (Bandar Seri Begawan)21
    21 days with some rainfall
  • 23°C minimum night-time temperature in September in Brunei (Bandar Seri Begawan)23
    23°C min night temperature
  • 12 hours of daylight per day in September in Brunei (Bandar Seri Begawan)12
    12 hours of daylight per day
  • Very high heat & humidity in September in Brunei (Bandar Seri Begawan)VH
    Very High heat & humidity
  • 307 mm monthly rainfall in September in Brunei (Bandar Seri Begawan)307
    307 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Brunei (Bandar Seri Begawan)11
    11+ (Extreme) UV index
  • 30°C sea temperature in September in Brunei (Bandar Seri Begawan)30
    30°C sea temperature

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The September weather guide for Brunei (Bandar Seri Begawan) 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.

Top Brunei destinations

Below are average maximum temperatures at popular countries, regions and places in Brunei in September. Select a holiday destination to see more weather parameters.

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

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How hot is it in Brunei in September?

Daytime temperatures usually reach 32°C in Bandar Seri Begawan, Brunei in September with very high heat and humidity, falling to 23°C at night.

How sunny is it in Brunei in September?

There are normally 6 hours of bright sunshine each day in Bandar Seri Begawan, Brunei in September - that's 53% of daylight hours.

How warm is the sea around Brunei in September?

The average sea temperature around Bandar Seri Begawan, Brunei in September is 30°C.

Does it rain in Brunei in September?

There are usually 21 days with some rain in Bandar Seri Begawan, Brunei in September and the average monthly rainfall is 307mm.

Brunei September sunrise & sunset times

Browse the sunrise and sunset times for Brunei in September 2025. Select a month to view Brunei sunrise and sunset times for the next 12 months. The Brunei sunrise and sunset times shown below are for Bandar Seri Begawan.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:14 18:26
Monday, 15th September 2025 06:11 18:20
Tuesday, 30th September 2025 06:08 18:12

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