Yakushima weather in September 2025

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

  • 25°C maximum daytime temperature in September in Yakushima25
    25°C max day temperature
  • 5 hours of sunshine per day
  • 20 days with some rainfall in September in Yakushima20
    20 days with some rainfall
  • 20°C minimum night-time temperature in September in Yakushima20
    20°C min night temperature
  • 12 hours of daylight per day in September in Yakushima12
    12 hours of daylight per day
  • Moderate heat & humidity in September in YakushimaM
    Moderate heat & humidity
  • 330 mm monthly rainfall in September in Yakushima330
    330 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in September in Yakushima9
    9 (Very High) UV index
  • 28°C sea temperature in September in Yakushima28
    28°C sea temperature

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The September weather guide for Japan (Yakushima) 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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More about Japan

How hot is it in Yakushima in September?

Daytime temperatures usually reach 25°C in Yakushima in September with moderate heat and humidity, falling to 20°C at night.

How sunny is it in Yakushima in September?

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

How warm is the sea around Yakushima in September?

The average sea temperature around Yakushima in September is 28°C.

Does it rain in Yakushima in September?

There are usually 20 days with some rain in Yakushima in September and the average monthly rainfall is 330mm.

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

On average 1.7 days in September in Yakushima are likely to be affected by the passage of one or more tropical storms.

Yakushima September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:54 18:40
Monday, 15th September 2025 06:02 18:23
Tuesday, 30th September 2025 06:10 18:04

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