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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.
- 2626°C max day temperature
- 6 hours of sunshine per day
- 1010 days with some rainfall
- 1919°C min night temperature
- 1212 hours of daylight per day
- LLow heat & humidity
- 188188 mm of monthly rainfall
- 88 (Very High) UV index
- 2525°C sea temperature
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Recommended for South Korea
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)
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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