Koya weather in December 2025

Expect daytime maximum temperatures of 9°C in Koya, Japan in December based on long-term weather averages. There are 5 hours of sunshine per day on average with 14 days with some rainfall and typically 42 mm of rainfall in the month.

  • 9°C maximum daytime temperature in December in Koya9
    9°C max day temperature
  • 5 hours of sunshine per day
  • 14 days with some rainfall in December in Koya14
    14 days with some rainfall
  • 1°C minimum night-time temperature in December in Koya1
    1°C min night temperature
  • 10 hours of daylight per day in December in Koya10
    10 hours of daylight per day
  • No heat & humidity in December in Koya0
    No heat & humidity
  • 42 mm monthly rainfall in December in Koya42
    42 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in December in Koya3
    3 (Moderate) UV index

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The December weather guide for Japan (Koya) 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 warm is it in Koya in December?

Daytime temperatures usually reach 12°C in Koya in December, falling to 3°C at night.

How sunny is it in Koya in December?

There are normally 6 hours of bright sunshine each day in Koya in December - that's 57% of daylight hours.

How warm is the sea around Koya in December?

The average sea temperature around Koya in December is 17°C.

Does it rain in Koya in December?

There are usually 9 days with some rain in Koya in December and the average monthly rainfall is 44mm.

Koya December sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 06:45 16:48
Tuesday, 16th December 2025 06:57 16:50
Wednesday, 31st December 2025 07:03 16:58

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