South Korea weather in September 2025

Expect 25°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in South Korea in September. Check more long-term weather averages for South Korea in September before you book your next holiday to South Korea in 2025/2026.

  • 25°C maximum daytime temperature in September in South Korea (Seoul)25
    25°C max day temperature
  • 7 hours of sunshine per day
  • 9 days with some rainfall in September in South Korea (Seoul)9
    9 days with some rainfall
  • 16°C minimum night-time temperature in September in South Korea (Seoul)16
    16°C min night temperature
  • 12 hours of daylight per day in September in South Korea (Seoul)12
    12 hours of daylight per day
  • Low heat & humidity in September in South Korea (Seoul)L
    Low heat & humidity
  • 161 mm monthly rainfall in September in South Korea (Seoul)161
    161 mm of monthly rainfall
  • UV (maximum) index 7 (High) in September in South Korea (Seoul)7
    7 (High) UV index

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The September weather guide for South Korea (Seoul) 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.

Top South Korea destinations

Below are average maximum temperatures at popular countries, regions and places in South Korea in September. Select a holiday destination to see more weather parameters.

All South Korea destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in South Korea in September?

Daytime temperatures usually reach 25°C in Seoul, South Korea in September with low heat and humidity, falling to 16°C at night.

How sunny is it in South Korea in September?

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

Does it rain in South Korea in September?

There are usually 9 days with some rain in Seoul, South Korea in September and the average monthly rainfall is 161mm.

What is the chance of a typhoon in South Korea in September?

On average less than 1 day in September in Seoul, South Korea is likely to be affected by the passage of one or more tropical storms.

South Korea September sunrise & sunset times

Browse the sunrise and sunset times for South Korea in September 2025. Select a month to view South Korea sunrise and sunset times for the next 12 months. The South Korea sunrise and sunset times shown below are for Seoul.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:02 19:01
Monday, 15th September 2025 06:14 18:40
Tuesday, 30th September 2025 06:26 18:17

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