Osaka weather in September 2025

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

  • 29°C maximum daytime temperature in September in Osaka29
    29°C max day temperature
  • 5 hours of sunshine per day
  • 17 days with some rainfall in September in Osaka17
    17 days with some rainfall
  • 21°C minimum night-time temperature in September in Osaka21
    21°C min night temperature
  • 12 hours of daylight per day in September in Osaka12
    12 hours of daylight per day
  • Moderate heat & humidity in September in OsakaM
    Moderate heat & humidity
  • 183 mm monthly rainfall in September in Osaka183
    183 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in September in Osaka8
    8 (Very High) UV index
  • 26°C sea temperature in September in Osaka26
    26°C sea temperature

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

Daytime temperatures usually reach 29°C in Osaka in September with moderate heat and humidity, falling to 21°C at night.

How sunny is it in Osaka in September?

There are normally 5 hours of bright sunshine each day in Osaka in September - that's 39% of daylight hours.

How warm is the sea around Osaka in September?

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

Does it rain in Osaka in September?

There are usually 17 days with some rain in Osaka in September and the average monthly rainfall is 183mm.

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

On average 1.4 days in September in Osaka are likely to be affected by the passage of one or more tropical storms.

Osaka September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:31 18:25
Monday, 15th September 2025 05:41 18:05
Tuesday, 30th September 2025 05:52 17:44

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