Koya weather in January 2026

Q: How warm is it in Koya in January?

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

Q: 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.

Q: How warm is the sea around Koya in January?

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

Q: 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.

Expect daytime maximum temperatures of 43°F 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 2.0 inches of rainfall in the month.

43
43°F max day temperature
5
5 hours of sunshine per day
17
17 days with some rainfall
30
30°F min night temperature
10
10 hours of daylight per day
0
No heat & humidity
2.0
2.0 inches of monthly rainfall
3
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) | Imperial (°F)

More about Japan

How warm is it in Koya in January?

Daytime temperatures usually reach 50°F in Koya in January, falling to 32°F 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 59°F.

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 1.7 inches.

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.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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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Japan - quick facts
Flight time^✝	11.5 to 15 hours
Time difference	UK +9 hours
Language(s)	Japanese
Currency	Japanese Yen
Electricity	A + B plug (100V)
Driving side	Left
Why visit?	Culture Nature Nightlife
Tourist info	Japan National Tourism Organization