Charleston weather in December
December in Charleston: cool, rainy, with clean air — a great time to visit.
#8 of 12 months in Charleston · #245 of 604 destinations to visit in December · comfort 73/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Charleston climate normals — December
| Daytime high | 17°C / 62°F | 🙂 cool |
|---|---|---|
| Nighttime low | 10°C / 50°F | |
| Feels like (high) | 15°C / 59°F | |
| Rainfall | 124 mm / 4.9 in | 🌧 rainy |
| Rainy days | 9 days | |
| Humidity | 74% | 💧 humid |
| Dew point | 8°C / 46°F | |
| Sunshine | 7 h/day | |
| Daylight | 10 h | |
| Wind | 19 km/h / 12 mph | |
| Air quality (US AQI) | 36 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Charleston in December — FAQ
- Is December a good time to visit Charleston?
- December in Charleston: cool, rainy, with clean air — a great time to visit. It ranks #8 of 12 months for Charleston on SeasonMap's comfort score (73/100).
- What is the weather like in Charleston in December?
- In December, Charleston averages a daily high of 16.7°C and a low of 10°C, with about 123.9 mm of rain over roughly 9.2 rainy days.
- What is the air quality in Charleston in December?
- Charleston has a mean US Air Quality Index of about 36 in December.