Koya weather in December 2025

Expect 48°F daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Koya in December. Check more long-term weather averages for Koya in December before you book your next holiday to Japan in 2025/2026.

  • 48°F maximum daytime temperature in December in Koya48
    48°F max day temperature
  • 5 hours of sunshine per day
  • 14 days with some rainfall in December in Koya14
    14 days with some rainfall
  • 34°F minimum night-time temperature in December in Koya34
    34°F 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
  • 1.7 inches monthly rainfall in December in Koya1.7
    1.7 inches 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)  |  Imperial (°F)

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How warm is it in Koya in December?

Daytime temperatures usually reach 48°F in Koya in December, falling to 34°F at night.

How sunny is it in Koya in December?

There are normally 5 hours of bright sunshine each day in Koya in December - that's 47% of daylight hours.

Does it rain in Koya in December?

There are usually 14 days with some rain in Koya in December and the average monthly rainfall is 1.7 inches.

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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