Kumamoto weather in September 2025

Expect 29°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Kumamoto in September. Check more long-term weather averages for Kumamoto in September before you book your next holiday to Japan in 2025/2026.

  • 29°C maximum daytime temperature in September in Kumamoto29
    29°C max day temperature
  • 5 hours of sunshine per day
  • 17 days with some rainfall in September in Kumamoto17
    17 days with some rainfall
  • 20°C minimum night-time temperature in September in Kumamoto20
    20°C min night temperature
  • 12 hours of daylight per day in September in Kumamoto12
    12 hours of daylight per day
  • Moderate heat & humidity in September in KumamotoM
    Moderate heat & humidity
  • 169 mm monthly rainfall in September in Kumamoto169
    169 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in September in Kumamoto9
    9 (Very High) UV index
  • 26°C sea temperature in September in Kumamoto26
    26°C sea temperature

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The September weather guide for Japan (Kumamoto) 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 Kumamoto in September?

Daytime temperatures usually reach 29°C in Kumamoto in September with moderate heat and humidity, falling to 20°C at night.

How sunny is it in Kumamoto in September?

There are normally 5 hours of bright sunshine each day in Kumamoto in September - that's 43% of daylight hours.

How warm is the sea around Kumamoto in September?

The average sea temperature around Kumamoto in September is 26°C.

Does it rain in Kumamoto in September?

There are usually 17 days with some rain in Kumamoto in September and the average monthly rainfall is 169mm.

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

On average 1.6 days in September in Kumamoto are likely to be affected by the passage of one or more tropical storms.

Kumamoto September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:52 18:42
Monday, 15th September 2025 06:01 18:24
Tuesday, 30th September 2025 06:10 18:03

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