Korea by month / September
Korea in September
Last checked: October 2026
Summer heat fades and the rain eases, though typhoons are still possible. Chuseok, Korea's harvest holiday, often falls this month.
- Season
- Autumn
- Seoul high / low
- 26°C / 18°C
- Rain in Seoul
- 142 mm
- Don't miss
- Chuseok holiday (September 24–26 in 2026): palaces and markets get busy, some shops close, and KTX trains sell out
Weather
| City | Average high | Average low | Rain |
|---|---|---|---|
| Seoul | 26.2°C (79°F) | 17.7°C (64°F) | 142 mm |
| Busan | 26.4°C (80°F) | 19.8°C (68°F) | 161 mm |
| Jeju | 26.1°C (79°F) | 20.9°C (70°F) | 228 mm |
Averages for 1991–2020 from the Korea Meteorological Administration. Check the forecast before you pack.
What to wear
Summer clothes early in the month, with a light layer by the end.
What's on in September
Good to know
- Book trains well ahead if your trip overlaps Chuseok.
Sources
- Korea Meteorological Administration – climatological normals 1991–2020
- Events and seasonal sights: see the sources on each linked guide.
Plan the rest
- Before you go: the checklist
- Seoul, Busan, and Jeju guides