Jeju weather in September 2026

Expect daytime maximum temperatures of 79°F in Jeju, South Korea in September based on long-term weather averages. There are 6 hours of sunshine per day on average with 10 days with some rainfall and typically 7.4 inches of rainfall in the month.

  • 79°F maximum daytime temperature in September in Jeju79
    79°F max day temperature
  • 6 hours of sunshine per day
  • 10 days with some rainfall in September in Jeju10
    10 days with some rainfall
  • 66°F minimum night-time temperature in September in Jeju66
    66°F 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
  • 7.4 inches monthly rainfall in September in Jeju7.4
    7.4 inches of monthly rainfall
  • UV (maximum) index 8 (Very High) in September in Jeju8
    8 (Very High) UV index
  • 77°F sea temperature in September in Jeju77
    77°F 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)  |  Imperial (°F)

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How hot is it in Jeju in September?

Daytime temperatures usually reach 77°F in Jeju in September with low heat and humidity, falling to 61°F at night.

How sunny is it in Jeju in September?

There are normally 7 hours of bright sunshine each day in Jeju in September - that's 54% of daylight hours.

Does it rain in Jeju in September?

There are usually 9 days with some rain in Jeju in September and the average monthly rainfall is 6.3 inches.

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

On average less than 1 day in September in Jeju is 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 2026. Select a month to view Jeju sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st September 2026 06:08 19:00
Tuesday, 15th September 2026 06:17 18:41
Wednesday, 30th September 2026 06:27 18:20

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