Jeju weather in September 2025

Expect 26°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Jeju in September. Check more long-term weather averages for Jeju in September before you book your next holiday to South Korea in 2025/2026.

  • 26°C maximum daytime temperature in September in Jeju26
    26°C max day temperature
  • 6 hours of sunshine per day
  • 10 days with some rainfall in September in Jeju10
    10 days with some rainfall
  • 19°C minimum night-time temperature in September in Jeju19
    19°C min night temperature
  • 12 hours of daylight per day in September in Jeju12
    12 hours of daylight per day
  • Low heat & humidity in September in JejuL
    Low heat & humidity
  • 188 mm monthly rainfall in September in Jeju188
    188 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in September in Jeju8
    8 (Very High) UV index
  • 25°C sea temperature in September in Jeju25
    25°C sea temperature

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The September weather guide for South Korea (Jeju) 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 Jeju in September?

Daytime temperatures usually reach 26°C in Jeju in September with low heat and humidity, falling to 19°C at night.

How sunny is it in Jeju in September?

There are normally 6 hours of bright sunshine each day in Jeju in September - that's 51% of daylight hours.

How warm is the sea around Jeju in September?

The average sea temperature around Jeju in September is 25°C.

Does it rain in Jeju in September?

There are usually 10 days with some rain in Jeju in September and the average monthly rainfall is 188mm.

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

On average 1.1 days in September in Jeju are likely to be affected by the passage of one or more tropical storms.

Jeju September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:08 19:00
Monday, 15th September 2025 06:17 18:41
Tuesday, 30th September 2025 06:27 18:20

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