When to go · Seoul
Seoul in September
Mixed month. Still warm; Chuseok some years.
Key facts
- Verdict
- Mixed
- Temperature
- 26°C (79°F)79°F (26°C) / 18°C (64°F)64°F (18°C)
- average high / low
- Rain days
- 9
- Crowds
- Medium
- South Korea overall
- Prices
- Medium
- South Korea overall
Verdict
Still warm; Chuseok some years.
All twelve months in one grid — weather, crowds and prices, with gaps left as unknown.
Is another month better than September?
September is rated mixed. These months rate higher:
Weather in September
- SeoulHighs around 26 °C (79 °F), lows around 18 °C (64 °F), rain on about 9 daysHighs around 79 °F (26 °C), lows around 64 °F (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 (5 °F) on cold snaps, hot humid summers. Fine dust (yellow dust and pollution) peaks Mar–Apr; the monsoon runs late Jun – Jul.Continental: dry winters down to 5 °F (−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.
Compare two months
Weather, crowds and prices for any two months in Seoul, side by side.
Verdict
Sep: Mixed
Apr: Great (better)
Daytime high
Sep: 26 °C (79 °F)79 °F (26 °C)
Apr: 18 °C (64 °F)64 °F (18 °C)
Night low
Sep: 18 °C (64 °F)64 °F (18 °C)
Apr: 7 °C (45 °F)45 °F (7 °C)
Rain days
Sep: 9
Apr: 9
Crowds
Sep: Medium
Apr: High
Prices
Sep: Medium
Apr: High
Festivals listed
Sep: 1
Apr: 4
September: Still warm; Chuseok some years.
April: Blossoms and mild; palaces are busy.
Seoul: figures are long-term averages from this guide, not a forecast.
What to pack
Nothing unusual for the weather this month.