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Charleston Weather by Month
Average temperatures, rainfall and humidity for Charleston, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Charleston month looks like before you travel — then check the live Charleston forecast for the days ahead.
Warmest month
July
29°C average high
Coolest month
January
-5°C average low
Wettest month
June
93 mm of rain
Driest month
January
46 mm of rain
Average temperature and rainfall in Charleston 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 | -5°C | -26°C / 19°C | 46 mm | 77% | 15 km/h |
| February | 5°C | -4°C | -28°C / 24°C | 49 mm | 75% | 15 km/h |
| March | 12°C | 1°C | -22°C / 30°C | 80 mm | 67% | 16 km/h |
| April | 18°C | 7°C | -7°C / 29°C | 84 mm | 65% | 16 km/h |
| May | 23°C | 12°C | -1°C / 32°C | 82 mm | 69% | 14 km/h |
| June | 28°C | 17°C | 5°C / 36°C | 93 mm | 71% | 12 km/h |
| July | 29°C | 19°C | 11°C / 36°C | 72 mm | 74% | 10 km/h |
| August | 28°C | 18°C | 8°C / 36°C | 75 mm | 75% | 10 km/h |
| September | 26°C | 14°C | 4°C / 35°C | 68 mm | 74% | 10 km/h |
| October | 19°C | 8°C | -4°C / 33°C | 64 mm | 73% | 13 km/h |
| November | 11°C | 2°C | -14°C / 26°C | 63 mm | 72% | 14 km/h |
| December | 6°C | -1°C | -21°C / 20°C | 62 mm | 78% | 14 km/h |
Best time to visit Charleston
The most comfortable time to visit Charleston is generally May and August to September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around June, totalling about 837 mm a year.
Travellers who prefer heat should aim for July, when highs average 29°C. June is the month to avoid if rain would spoil your plans — it averages 93 mm, roughly 2× the rainfall of the driest month (January).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Charleston forecast for what is happening now.