When to go · Seoul
Seoul in September
Mixed month. Still warm; Chuseok some years.
Key facts
- Verdict
- Mixed
- Temperature
- 26° / 18°
- average high / low
- Rain days
- 9
- Crowds
- Medium
- South Korea overall
- Prices
- Medium
- South Korea overall
Verdict
Still warm; Chuseok some years.
Weather in September
- SeoulHighs around 26 °C, lows around 18 °C, rain on about 9 days
- Seoul and north-west, South Korea · Seoul, Incheon, Suwon, the DMZfine
Continental: dry winters down to −15 °C on cold snaps, hot humid summers. Fine dust (yellow dust and pollution) peaks Mar–Apr; the monsoon runs late Jun – Jul.
Autumn season
Clear skies, palace gardens in red and gold, the fireworks festival.
Watch: Chuseok closures; October is the busiest month for rooms.
Festivals and holidays
Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.
Chuseok (harvest festival) check
15th of the 8th lunar month; around 14–16 September in 2027 · Whole city
Three-day holiday: Seoul empties, many local restaurants close, palaces and museums mostly open.
Crowds and prices
- Crowds · South Korea overall
- Medium
- Prices · South Korea overall
- Medium
South Korea overall: Heat eases; typhoon risk remains and Chuseok shuts the country for 3 days in many years.
What to pack
Nothing unusual for the weather this month.