Nagasaki weather in September 2025

Expect 28°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Nagasaki in September. Check more long-term weather averages for Nagasaki in September before you book your next holiday to Japan in 2025/2026.

  • 28°C maximum daytime temperature in September in Nagasaki28
    28°C max day temperature
  • 6 hours of sunshine per day
  • 17 days with some rainfall in September in Nagasaki17
    17 days with some rainfall
  • 20°C minimum night-time temperature in September in Nagasaki20
    20°C min night temperature
  • 12 hours of daylight per day in September in Nagasaki12
    12 hours of daylight per day
  • Moderate heat & humidity in September in NagasakiM
    Moderate heat & humidity
  • 201 mm monthly rainfall in September in Nagasaki201
    201 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in September in Nagasaki9
    9 (Very High) UV index
  • 26°C sea temperature in September in Nagasaki26
    26°C sea temperature

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

Daytime temperatures usually reach 28°C in Nagasaki in September with moderate heat and humidity, falling to 20°C at night.

How sunny is it in Nagasaki in September?

There are normally 6 hours of bright sunshine each day in Nagasaki in September - that's 44% of daylight hours.

How warm is the sea around Nagasaki in September?

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

Does it rain in Nagasaki in September?

There are usually 17 days with some rain in Nagasaki in September and the average monthly rainfall is 201mm.

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

On average 1.5 days in September in Nagasaki are likely to be affected by the passage of one or more tropical storms.

Nagasaki September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:55 18:46
Monday, 15th September 2025 06:04 18:27
Tuesday, 30th September 2025 06:14 18:07

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