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Get the Charleston SC weather forecast without ads, cookies, or tracking. Open-Meteo data, 10-day forecast, hourly conditions, and radar — all free. click here to hide this
July is the hottest month in Charleston SC, with an average high of 91°F / 33°C; January is the coldest (60°F / 16°C). August is the wettest month, averaging 7.0 in / 177 mm of precipitation.
| Month | High °F / °C | Low °F / °C | Precip in / mm | Wet days |
|---|---|---|---|---|
| Jan | 60 / 16 | 39 / 4 | 3.4 / 86 | 7 |
| Feb | 64 / 18 | 42 / 5 | 3.0 / 77 | 7 |
| Mar | 70 / 21 | 47 / 9 | 3.3 / 85 | 7 |
| Apr | 77 / 25 | 55 / 13 | 3.3 / 84 | 6 |
| May | 84 / 29 | 63 / 17 | 3.3 / 84 | 6 |
| Jun | 89 / 32 | 71 / 21 | 6.2 / 158 | 10 |
| Jul | 91 / 33 | 74 / 23 | 6.6 / 168 | 11 |
| Aug | 90 / 32 | 73 / 23 | 7.0 / 177 | 11 |
| Sep | 85 / 30 | 69 / 20 | 6.0 / 153 | 8 |
| Oct | 78 / 26 | 58 / 14 | 4.3 / 110 | 6 |
| Nov | 69 / 21 | 47 / 9 | 2.7 / 68 | 5 |
| Dec | 63 / 17 | 42 / 5 | 3.3 / 85 | 7 |
Extremes since 1937: highest 105°F / 41°C (August 1, 1999), lowest 6°F / -14°C (January 21, 1985).
Daylight lasts about 14.2 hours in June and 9.8 hours in December.
Data: Meteostat — Charleston Airport, 1991–2020 averages.
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