Biak weather in September 2026

Expect daytime maximum temperatures of 86°F in Biak, Indonesia in September and high heat and humidity based on long-term weather averages. There are 6 hours of sunshine per day on average with 17 days with some rainfall and typically 8.3 inches of rainfall in the month.

  • 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 91°F in Biak in September with very high heat and humidity, falling to 73°F at night.

How sunny is it in Biak in September?

There are normally 9 hours of bright sunshine each day in Biak in September - that's 71% 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 8 days with some rain in Biak in September and the average monthly rainfall is 3.7 inches.

Biak September sunrise & sunset times

Browse the sunrise and sunset times for Biak in September 2026. Select a month to view Biak sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st September 2026 05:53 17:58
Tuesday, 15th September 2026 05:48 17:54
Wednesday, 30th September 2026 05:42 17:49

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