Koya weather in May 2025

Expect 21°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Koya in May. Check more long-term weather averages for Koya in May before you book your next holiday to Japan in 2025/2026.

  • 21°C maximum daytime temperature in May in Koya21
    21°C max day temperature
  • 6 hours of sunshine per day
  • 16 days with some rainfall in May in Koya16
    16 days with some rainfall
  • 12°C minimum night-time temperature in May in Koya12
    12°C min night temperature
  • 14 hours of daylight per day in May in Koya14
    14 hours of daylight per day
  • No heat & humidity in May in Koya0
    No heat & humidity
  • 197 mm monthly rainfall in May in Koya197
    197 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in May in Koya9
    9 (Very High) UV index

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The May 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 hot is it in Koya in May?

Daytime temperatures usually reach 21°C in Koya in May, falling to 12°C at night.

How sunny is it in Koya in May?

There are normally 6 hours of bright sunshine each day in Koya in May - that's 43% of daylight hours.

Does it rain in Koya in May?

There are usually 16 days with some rain in Koya in May and the average monthly rainfall is 197mm.

Koya May sunrise & sunset times

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


Date Sunrise times Sunset times
Thursday, 1st May 2025 05:08 18:42
Friday, 16th May 2025 04:55 18:53
Saturday, 31st May 2025 04:47 19:04

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