Koya weather in September 2025

Expect 25°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Koya in September. Check more long-term weather averages for Koya in September before you book your next holiday to Japan in 2025/2026.

  • 25°C maximum daytime temperature in September in Koya25
    25°C max day temperature
  • 5 hours of sunshine per day
  • 18 days with some rainfall in September in Koya18
    18 days with some rainfall
  • 18°C minimum night-time temperature in September in Koya18
    18°C min night temperature
  • 12 hours of daylight per day in September in Koya12
    12 hours of daylight per day
  • No heat & humidity in September in Koya0
    No heat & humidity
  • 272 mm monthly rainfall in September in Koya272
    272 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in September in Koya9
    9 (Very High) UV index

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The September 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 September?

Daytime temperatures usually reach 25°C in Koya in September with no heat and humidity, falling to 18°C at night.

How sunny is it in Koya in September?

There are normally 5 hours of bright sunshine each day in Koya in September - that's 37% of daylight hours.

Does it rain in Koya in September?

There are usually 18 days with some rain in Koya in September and the average monthly rainfall is 272mm.

What is the chance of a typhoon in Koya in September?

On average 1.3 days in September in Koya are likely to be affected by the passage of one or more tropical storms.

Koya September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:31 18:24
Monday, 15th September 2025 05:41 18:05
Tuesday, 30th September 2025 05:51 17:44

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