Charleston, SC Weather
Charleston hourly forecast: next 24 hours
Today's high of 92°F (34°C) is about 4°F (2°C) above the typical July high of 88°F (31°C).
Current conditions in detail
Charleston weather tomorrow (Saturday, July 18)
Tomorrow in Charleston looks sunny, with a high of 90° and an overnight low of 80°. Precipitation chance is modest at 36%. Winds top out near 14 mph, and the UV index reaches 11 (very high).
Charleston 14-day forecast
About the weather in Charleston
Charleston has a humid subtropical climate, marked by hot, humid summers and generally mild winters. Average daytime highs range from about 58°F (15°C) in January to around 88°F (31°C) in July, and the city records roughly 136 days of measurable precipitation a year.
Charleston weather: quick facts
- Hottest month: July - highs near 88°F (31°C)
- Coldest month: January - highs near 58°F (15°C)
- Record high: 98°F (37°C) · Record low: 11°F (-11°C) (2015–2024)
- Wettest month: August (19 rainy days) · Sunniest: June (11.6 h sun/day)
- Climate type: humid subtropical - hot, humid summers and generally mild winters
Temperatures through the year
The warmest stretch of the year centers on July. Highs average 88°F (31°C) and overnight lows stay near 77°F (25°C). The coolest month is January, with typical highs of 58°F (15°C) and lows around 44°F (7°C). Based on 2015–2024 weather data, temperatures have reached as high as 98°F (37°C) and dropped as low as 11°F (-11°C).
Rain, sun and snow
August is usually the wettest month. It brings about 7.0 inches (177 mm) of rain over 19 days, while March is the driest. June brings the most sunshine, averaging 11.6 hours of sun a day.
Season by season
Spring (March through May)
Spring in Charleston is mild and warm, with daytime highs averaging 73°F (23°C) and nights around 60°F (15°C); expect showers on roughly 28 days across the season.
Summer (June through August)
Summer in Charleston brings hot afternoons, with daytime highs averaging 86°F (30°C) and nights around 76°F (24°C); expect showers on roughly 52 days across the season. With the humidity factored in, afternoons often feel hotter than the thermometer reads - run the numbers through the humidity and dew point converter to see why.
Fall (September through November)
Fall in Charleston brings comfortable warmth, with daytime highs averaging 76°F (24°C) and nights around 63°F (17°C); expect showers on roughly 29 days across the season.
Winter (December through February)
Winter in Charleston is crisp but comfortable, with daytime highs averaging 61°F (16°C) and nights around 47°F (8°C); expect showers on roughly 27 days across the season.
Average temperatures in Charleston by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 58° | 44° | 10 | 3.2 in | 7.6 h/day | 73% |
| February | 62° | 48° | 9 | 3.3 in | 8.0 h/day | 76% |
| March | 67° | 53° | 9 | 3.0 in | 8.9 h/day | 72% |
| April | 73° | 59° | 8 | 4.3 in | 10.8 h/day | 70% |
| May | 80° | 67° | 11 | 3.5 in | 11.5 h/day | 73% |
| June | 85° | 74° | 16 | 4.8 in | 11.6 h/day | 77% |
| July | 88° | 77° | 17 | 4.9 in | 11.5 h/day | 78% |
| August | 86° | 76° | 19 | 7.0 in | 10.7 h/day | 81% |
| September | 83° | 72° | 14 | 5.9 in | 9.9 h/day | 79% |
| October | 76° | 63° | 7 | 3.7 in | 9.3 h/day | 75% |
| November | 67° | 53° | 8 | 3.2 in | 8.2 h/day | 75% |
| December | 62° | 49° | 9 | 4.8 in | 7.0 h/day | 77% |