Charleston, SC Weather
Charleston hourly forecast: next 24 hours
Today's high of 83°F (28°C) is about 3°F (2°C) below the typical August high of 86°F (30°C).
Current conditions in detail
Charleston weather tomorrow (Thursday, August 27)
Tomorrow in Charleston looks patchy rain nearby, with a high of 90° and an overnight low of 74°. There is a 77% chance of rain - plan accordingly. Winds top out near 11 mph, and the UV index reaches 8 (high).
Charleston 14-day forecast
About the weather in Charleston
Charleston averages 67°F (20°C) across the year, with 9.6 hours of sunshine a day and 51.6 inches (1310 mm) of precipitation. The spread runs from January, at 58°F (15°C), to July, at 88°F (31°C).
Charleston weather: quick facts
- Hottest month: July - highs near 88°F (31°C)
- Coldest month: January - highs near 58°F (15°C)
- Decade extremes (2015-2024): 98°F (37°C) high · 11°F (-11°C) low
- Wettest month: August (19 rainy days) · Sunniest: June (11.6 h sun/day)
- Climate type: humid subtropical
- Annual swing: 17°C between the average warmest and coolest month · day to night: 7°C
- Months averaging 30°C or hotter: 1
- Average humidity: 76%
Temperatures through the year
January bottoms out at 58°F (15°C) in daylight, 44°F (7°C) after dark. Warmth peaks in July: highs of 88°F (31°C), lows of 77°F (25°C). Sunshine averages 9.6 hours a day over the year, peaking in June at 11.6 hours.
Rain, sun and snow
Five of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is March through May. Days and nights are about 7°C apart on average - narrower than about 80% of the cities we track. Precipitation concentrates in August - 7.0 inches (177 mm) on 19 days - and thins out by March. Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 98°F (37°C) and the lowest daily minimum 11°F (-11°C).
Season by season
Spring (March through May)
Through spring, Charleston is mild and warm: 73°F (23°C) by day, 60°F (15°C) after dark, and expect showers on roughly 28 days across the season. Daylight is generous - around 10.4 hours of sun a day.
Summer (June through August)
Summer runs hot here - highs near 86°F (30°C), nights near 76°F (24°C), and rain falls on around 52 of the 90 days. Daylight is generous - around 11.3 hours of sun a day. With the moisture factored in, afternoons feel hotter than the reading suggests - the humidity and dew point converter shows why.
Fall (September through November)
Through fall, Charleston is mild and warm: 76°F (24°C) by day, 63°F (17°C) after dark, and expect showers on roughly 29 days across the season.
Winter (December through February)
Through winter, Charleston is mild: 61°F (16°C) by day, 47°F (8°C) after dark, and 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% |