Koya weather in January 2026

Expect daytime maximum temperatures of 6°C in Koya, Japan in January based on long-term weather averages. There are 5 hours of sunshine per day on average with 17 days with some rainfall and typically 51 mm of rainfall in the month.

  • 6°C maximum daytime temperature in January in Koya6
    6°C max day temperature
  • 5 hours of sunshine per day
  • 17 days with some rainfall in January in Koya17
    17 days with some rainfall
  • -1°C minimum night-time temperature in January in Koya-1
    -1°C min night temperature
  • 10 hours of daylight per day in January in Koya10
    10 hours of daylight per day
  • No heat & humidity in January in Koya0
    No heat & humidity
  • 51 mm monthly rainfall in January in Koya51
    51 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in January in Koya3
    3 (Moderate) UV index

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The January 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 January?

Daytime temperatures usually reach 10°C in Koya in January, falling to 0°C at night.

How sunny is it in Koya in January?

There are normally 6 hours of bright sunshine each day in Koya in January - that's 59% of daylight hours.

How warm is the sea around Koya in January?

The average sea temperature around Koya in January is 15°C.

Does it rain in Koya in January?

There are usually 9 days with some rain in Koya in January and the average monthly rainfall is 43mm.

Koya January sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st January 2026 07:04 16:59
Friday, 16th January 2026 07:03 17:12
Saturday, 31st January 2026 06:56 17:26

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