Biak weather in December 2025

Expect daytime maximum temperatures of 30°C in Biak, Indonesia in December and very high heat and humidity based on long-term weather averages. There are 4 hours of sunshine per day on average with 20 days with some rainfall and typically 240 mm of rainfall in the month.

  • 30°C maximum daytime temperature in December in Biak30
    30°C max day temperature
  • 4 hours of sunshine per day
  • 20 days with some rainfall in December in Biak20
    20 days with some rainfall
  • 23°C minimum night-time temperature in December in Biak23
    23°C min night temperature
  • 12 hours of daylight per day in December in Biak12
    12 hours of daylight per day
  • High heat & humidity in December in BiakH
    High heat & humidity
  • 240 mm monthly rainfall in December in Biak240
    240 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in December in Biak11
    11+ (Extreme) UV index
  • 29°C sea temperature in December in Biak29
    29°C sea temperature

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The December 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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How hot is it in Biak in December?

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

How sunny is it in Biak in December?

There are normally 4 hours of bright sunshine each day in Biak in December - that's 35% of daylight hours.

How warm is the sea around Biak in December?

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

Does it rain in Biak in December?

There are usually 20 days with some rain in Biak in December and the average monthly rainfall is 240mm.

Biak December sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 05:39 17:50
Tuesday, 16th December 2025 05:45 17:57
Wednesday, 31st December 2025 05:53 18:04

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