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Sejong Weather by Month
Average temperatures, rainfall and humidity for Sejong, Korea, South, month by month, built from OpenWeather’s historical records. Use it to see what a typical Sejong month looks like before you travel — then check the live Sejong forecast for the days ahead.
Warmest month
August
31°C average high
Coolest month
January
-6°C average low
Wettest month
July
132 mm of rain
Driest month
January
10 mm of rain
Average temperature and rainfall in Sejong by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 3°C | -6°C | -23°C / 14°C | 10 mm | 69% | 8 km/h |
| February | 6°C | -4°C | -18°C / 22°C | 22 mm | 64% | 9 km/h |
| March | 13°C | 1°C | -9°C / 26°C | 32 mm | 61% | 9 km/h |
| April | 19°C | 7°C | -3°C / 29°C | 44 mm | 60% | 9 km/h |
| May | 24°C | 12°C | 2°C / 33°C | 41 mm | 65% | 8 km/h |
| June | 28°C | 18°C | 8°C / 36°C | 57 mm | 72% | 7 km/h |
| July | 30°C | 22°C | 14°C / 37°C | 132 mm | 81% | 7 km/h |
| August | 31°C | 22°C | 13°C / 39°C | 100 mm | 79% | 7 km/h |
| September | 26°C | 17°C | 6°C / 35°C | 62 mm | 78% | 7 km/h |
| October | 19°C | 9°C | -3°C / 29°C | 53 mm | 75% | 7 km/h |
| November | 12°C | 3°C | -10°C / 24°C | 30 mm | 73% | 7 km/h |
| December | 4°C | -4°C | -18°C / 18°C | 15 mm | 73% | 8 km/h |
Best time to visit Sejong
The most comfortable time to visit Sejong is generally May to June and September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around July, totalling about 598 mm a year.
Travellers who prefer heat should aim for August, when highs average 31°C. July is the month to avoid if rain would spoil your plans — it averages 132 mm, roughly 14× the rainfall of the driest month (January).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Sejong forecast for what is happening now.