Biak weather in September 2025

Expect 30°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Biak in September. Check more long-term weather averages for Biak in September before you book your next holiday to Indonesia in 2025/2026.

  • 30°C maximum daytime temperature in September in Biak30
    30°C max day temperature
  • 6 hours of sunshine per day
  • 17 days with some rainfall in September in Biak17
    17 days with some rainfall
  • 22°C minimum night-time temperature in September in Biak22
    22°C min night temperature
  • 12 hours of daylight per day in September in Biak12
    12 hours of daylight per day
  • High heat & humidity in September in BiakH
    High heat & humidity
  • 210 mm monthly rainfall in September in Biak210
    210 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Biak11
    11+ (Extreme) UV index
  • 29°C sea temperature in September in Biak29
    29°C sea temperature

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The September weather guide for Indonesia (Biak) 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 Indonesia

How hot is it in Biak in September?

Daytime temperatures usually reach 30°C in Biak in September with high heat and humidity, falling to 22°C at night.

How sunny is it in Biak in September?

There are normally 6 hours of bright sunshine each day in Biak in September - that's 47% of daylight hours.

How warm is the sea around Biak in September?

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

Does it rain in Biak in September?

There are usually 17 days with some rain in Biak in September and the average monthly rainfall is 210mm.

Biak September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:53 17:58
Monday, 15th September 2025 05:48 17:54
Tuesday, 30th September 2025 05:42 17:49

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