A normal September in Seoul: 27°C by day, 19°C at night, rain on about 6.5 days (129 mm). What to wear: warm — short sleeves, a light layer for air-conditioning. It does not snow in Seoul in September. Public holidays: Chuseok (Korean Thanksgiving) (Sep 14), Chuseok (Korean Thanksgiving) (Sep 15), Chuseok (Korean Thanksgiving) (Sep 16).
September weather around Korea
| City | High / low °C | Rain mm | Rain days | Snow days | Humidity % |
|---|---|---|---|---|---|
| Seoul | 27° / 19° | 129 | 6.5 | 0.0 | 66 |
| Busan | 27° / 21° | 229 | 7.9 | 0.0 | 73 |
| Jeju City | 27° / 22° | 243 | 9.5 | 0.0 | 76 |
| Gangneung | 24° / 17° | 234 | 9.7 | 0.0 | 79 |
| Gyeongju | 27° / 17° | 189 | 9.3 | — | 82 |
| Jeonju | 28° / 18° | 149 | 7.3 | 0.0 | 76 |
| Daegwallyeong (ski area) | 21° / 11° | 193 | 11.0 | — | 87 |
Seoul daytime highs: August 31°C → September 27°C → October 21°C, so September is colder than the month before. For the next 10 days’ forecast see Korea weather.
Public holidays in September 2027
| Date | Holiday |
|---|---|
| Sep 14 (Tue) | Chuseok (Korean Thanksgiving) Lunar August 15 — the harvest festival. Three days off; like Seollal, expect closed family restaurants on the day and sold-out trains the day before. |
| Sep 15 (Wed) | Chuseok (Korean Thanksgiving) Lunar August 15 — the harvest festival. Three days off; like Seollal, expect closed family restaurants on the day and sold-out trains the day before. |
| Sep 16 (Thu) | Chuseok (Korean Thanksgiving) Lunar August 15 — the harvest festival. Three days off; like Seollal, expect closed family restaurants on the day and sold-out trains the day before. |
Banks and government offices close on these days; palaces, museums, shops and restaurants mostly open. See Korea public holidays for long weekends and what closes.
Festivals in September 2027
The Korea Tourism Organization has not published September 2027 festival dates yet — they are usually added a few weeks ahead. Festivals this month updates daily.
Plan the rest
FAQ
What is the weather like in Korea in September?
In Seoul a normal September has highs around 27°C and lows around 19°C, with rain on about 6.5 days. Jeju is 27°C / 22°C and Busan 27°C / 21°C.
What should I wear in Korea in September?
Warm — short sleeves, a light layer for air-conditioning. Mornings and evenings are around 19°C in Seoul.
Does it snow in Korea in September?
It does not snow in Seoul in September.
Are there public holidays in September 2027?
Chuseok (Korean Thanksgiving) on Sep 14; Chuseok (Korean Thanksgiving) on Sep 15; Chuseok (Korean Thanksgiving) on Sep 16.
Weather: Korea Meteorological Administration station records, 2011–2025 averages (not the official 1991–2020 normals). Holidays: Korea Astronomy and Space Science Institute. Festivals: Korea Tourism Organization (TourAPI). Page rebuilt 2026-10-01.
