Seoul Climate — Average Highs, Lows & Rainfall by Month
Seoul has a temperate climate with four distinct seasons. Daytime temperatures average 30°C / 86°F in July, the warmest month, and drop to 2°C / 35°F in January, the coldest. Overnight lows in January average -7°C / 20°F. Seoul receives about 1463 mm of rain a year across roughly 111 wet days, with July the wettest month.
Averages for 2021–2025 · Open-Meteo Historical Weather API (ERA5 reanalysis) · Updated 2026-10-05
Monthly averages in Seoul
Average daytime high, overnight low and rainfall for each month of the year.
| Month | Avg high | Avg low | Rainfall | Wet days |
|---|---|---|---|---|
| January | 2°C / 35°F | -7°C / 20°F | 19 mm | 4 |
| February | 5°C / 41°F | -5°C / 23°F | 17 mm | 4 |
| March | 12°C / 54°F | 1°C / 33°F | 58 mm | 7 |
| April | 18°C / 65°F | 7°C / 45°F | 74 mm | 7 |
| May | 22°C / 72°F | 12°C / 53°F | 126 mm | 9 |
| June | 27°C / 81°F | 18°C / 64°F | 169 mm | 13 |
| July | 30°C / 86°F | 23°C / 73°F | 305 mm | 18 |
| August | 29°C / 85°F | 23°C / 73°F | 289 mm | 18 |
| September | 26°C / 79°F | 18°C / 65°F | 215 mm | 11 |
| October | 19°C / 66°F | 10°C / 50°F | 105 mm | 9 |
| November | 12°C / 53°F | 2°C / 36°F | 56 mm | 6 |
| December | 3°C / 37°F | -5°C / 22°F | 30 mm | 5 |
Best time to visit Seoul
October, May, June offer the most comfortable weather in Seoul: mild daytime temperatures with the year's lowest rainfall — October averages 19°C (66°F); May averages 22°C (72°F); June averages 27°C (81°F).
Seoul climate FAQ
- What is the hottest month in Seoul?
- July is the hottest month in Seoul, with average daytime highs of 30°C / 86°F and overnight lows of 23°C / 73°F (averages for 2021–2025).
- What is the coldest month in Seoul?
- January is the coldest month in Seoul, with average highs of 2°C / 35°F and lows of -7°C / 20°F.
- How much rain does Seoul get a year?
- Seoul receives about 1463 mm of rainfall a year, spread over roughly 111 wet days. July is the wettest month (305 mm on average) and February the driest (17 mm).
- When is the best time to visit Seoul?
- October, May, June are the most comfortable months in Seoul: mild daytime temperatures with the least rainfall of the year.
Want today's conditions instead of averages?
See live weather in Seoul →Source: Open-Meteo Historical Weather API (ERA5 reanalysis), Open-Meteo. Averages are daily means across 2021–2025 and are rounded for display — for a live forecast see the Seoul weather page.