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August is the hottest month in Seoul, with an average high of 30°C / 86°F; January is the coldest (2°C / 36°F). July is the wettest month, averaging 428 mm / 16.9 in of precipitation.
| Month | High °C / °F | Low °C / °F | Precip mm / in | Wet days |
|---|---|---|---|---|
| Jan | 2 / 36 | -6 / 21 | 20 / 0.8 | 3 |
| Feb | 5 / 41 | -4 / 25 | 25 / 1.0 | 3 |
| Mar | 11 / 51 | 1 / 34 | 36 / 1.4 | 4 |
| Apr | 18 / 64 | 7 / 45 | 67 / 2.6 | 6 |
| May | 24 / 74 | 13 / 55 | 97 / 3.8 | 6 |
| Jun | 28 / 82 | 18 / 65 | 129 / 5.1 | 7 |
| Jul | 29 / 84 | 22 / 71 | 428 / 16.9 | 13 |
| Aug | 30 / 86 | 23 / 73 | 349 / 13.7 | 11 |
| Sep | 26 / 79 | 17 / 63 | 141 / 5.6 | 6 |
| Oct | 20 / 68 | 10 / 50 | 54 / 2.1 | 5 |
| Nov | 12 / 54 | 3 / 37 | 49 / 1.9 | 6 |
| Dec | 4 / 39 | -4 / 25 | 22 / 0.9 | 4 |
Extremes since 1950: highest 39°C / 103°F (August 1, 2018), lowest -22°C / -8°F (January 22, 1963).
Daylight lasts about 14.6 hours in June and 9.4 hours in December.
Data: Meteostat — Seoul, 1991–2020 averages.
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