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Sa-ch’on Weather by Month
Average temperatures, rainfall and humidity for Sa-ch’on, Korea, South, month by month, built from OpenWeather's historical records. Use it to see what a typical Sa-ch’on month looks like before you travel — then check the live Sa-ch’on forecast for the days ahead.
Warmest month
August
31°C average high
Coolest month
January
-6°C average low
Wettest month
August
114 mm of rain
Driest month
January
12 mm of rain
Average temperature and rainfall in Sa-ch’on 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 | 6°C | -6°C | -23°C / 17°C | 12 mm | 60% | 7 km/h |
| February | 8°C | -4°C | -19°C / 23°C | 28 mm | 60% | 8 km/h |
| March | 14°C | 1°C | -12°C / 26°C | 92 mm | 62% | 7 km/h |
| April | 20°C | 7°C | -4°C / 30°C | 70 mm | 62% | 6 km/h |
| May | 25°C | 12°C | 3°C / 35°C | 50 mm | 64% | 6 km/h |
| June | 28°C | 18°C | 7°C / 37°C | 72 mm | 72% | 6 km/h |
| July | 30°C | 22°C | 7°C / 37°C | 112 mm | 79% | 6 km/h |
| August | 31°C | 22°C | -3°C / 38°C | 114 mm | 78% | 6 km/h |
| September | 26°C | 17°C | -3°C / 38°C | 77 mm | 78% | 6 km/h |
| October | 21°C | 9°C | -6°C / 31°C | 53 mm | 72% | 6 km/h |
| November | 14°C | 2°C | -9°C / 31°C | 29 mm | 67% | 6 km/h |
| December | 7°C | -5°C | -21°C / 19°C | 12 mm | 63% | 7 km/h |
Best time to visit Sa-ch’on
The most comfortable time to visit Sa-ch’on is generally May and September to October, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around August, totalling about 720 mm a year.
Travellers who prefer heat should aim for August, when highs average 31°C. August is the month to avoid if rain would spoil your plans — it averages 114 mm, roughly 10× the rainfall of January.
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Sa-ch’on forecast for what is happening now.