Biak weather in September 2025

Expect 86°F 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.

  • 86°F maximum daytime temperature in September in Biak86
    86°F max day temperature
  • 6 hours of sunshine per day
  • 17 days with some rainfall in September in Biak17
    17 days with some rainfall
  • 72°F minimum night-time temperature in September in Biak72
    72°F 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
  • 8.3 inches monthly rainfall in September in Biak8.3
    8.3 inches of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Biak11
    11+ (Extreme) UV index
  • 84°F sea temperature in September in Biak84
    84°F 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)  |  Imperial (°F)

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More about Indonesia

How hot is it in Biak in September?

Daytime temperatures usually reach 86°F in Biak in September with high heat and humidity, falling to 72°F 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 84°F.

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 8.3 inches.

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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