Charleston County Climate
Charleston County, South Carolina
Avg Annual Temp
66.1°F
Annual Precip
51.2"
Annual Snowfall
0.3"
Extreme Heat Days
48.95
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Charleston County Weather
A Coastal Hub Warmer Than Most
Charleston County maintains a warm annual average temperature of 66.1°F, far exceeding the national median. This subtropical climate remains consistently mild compared to the broader United States. The county experiences a humid environment driven by its coastal location.
Well Above the South Carolina Average
The county's average temperature sits more than three degrees higher than the South Carolina state average of 62.8°F. This makes Charleston one of the warmest regions in the state. Its coastal proximity prevents the deeper temperature drops seen in the Upstate.
Warmer and Wetter Than Colleton
Charleston averages 66.1°F, outpacing neighboring Colleton County's 64.8°F. Rainfall here reaches 51.2 inches annually, exceeding the state average of 48.9 inches. Residents enjoy slightly more tropical conditions than their inland peers.
Endless Summers and Negligible Snow
Summer temperatures peak at an average of 81.9°F in July, while extreme heat days occur 49 times per year. Winter is mild with a 50.9°F average and a rare 0.3 inches of annual snowfall. The transition between seasons is often subtle and brief.
Prioritize Humidity Control and Light Gear
High annual precipitation of 51.2 inches requires robust drainage and moisture control for homes. HVAC systems should be optimized for cooling rather than heating to handle the 49 extreme heat days. Lightweight, breathable clothing is the standard for most of the year.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.