Hamamatsu weather in September 2025

Expect 27°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Hamamatsu in September. Check more long-term weather averages for Hamamatsu in September before you book your next holiday to Japan in 2025/2026.

  • 27°C maximum daytime temperature in September in Hamamatsu27
    27°C max day temperature
  • 5 hours of sunshine per day
  • 18 days with some rainfall in September in Hamamatsu18
    18 days with some rainfall
  • 20°C minimum night-time temperature in September in Hamamatsu20
    20°C min night temperature
  • 12 hours of daylight per day in September in Hamamatsu12
    12 hours of daylight per day
  • Moderate heat & humidity in September in HamamatsuM
    Moderate heat & humidity
  • 245 mm monthly rainfall in September in Hamamatsu245
    245 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in September in Hamamatsu8
    8 (Very High) UV index
  • 26°C sea temperature in September in Hamamatsu26
    26°C sea temperature

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

Daytime temperatures usually reach 27°C in Hamamatsu in September with moderate heat and humidity, falling to 20°C at night.

How sunny is it in Hamamatsu in September?

There are normally 5 hours of bright sunshine each day in Hamamatsu in September - that's 41% of daylight hours.

How warm is the sea around Hamamatsu in September?

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

Does it rain in Hamamatsu in September?

There are usually 18 days with some rain in Hamamatsu in September and the average monthly rainfall is 245mm.

Hamamatsu September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:22 18:16
Monday, 15th September 2025 05:32 17:56
Tuesday, 30th September 2025 05:43 17:35

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