Colleton County Climate
Colleton County, South Carolina
Avg Annual Temp
64.8°F
Annual Precip
51.4"
Annual Snowfall
0.0"
Extreme Heat Days
54.2
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Colleton County Weather
A Warm Subtropical Coastal Basin
Colleton County's annual average temperature of 64.8°F is significantly warmer than the national median. Its location near the coast provides a consistent maritime influence. The county avoids the sharp cold fronts that affect more inland states.
Warmer Than the State Median
The average temperature of 64.8°F is two degrees higher than the South Carolina state average of 62.8°F. Rainfall is also heavy, with 51.4 inches annually compared to the state's 48.9. This makes Colleton one of the warmer and wetter counties in the Lowcountry.
Milder Than Coastal Charleston
Colleton is slightly cooler than Charleston County's 66.1°F, providing a marginally more temperate experience. Both counties see high rainfall over 51 inches, outpacing inland neighbors. It shares the same humid characteristics as its famous coastal neighbor.
Snow-Free Winters and Steamy Summers
Colleton sees zero inches of snow on average, making it one of the few truly snow-free zones. July averages 81.2°F, and residents face 54 extreme heat days per year. Winter is very comfortable with a 49.4°F average.
Ditch the Shovels for Rain Boots
With 0.0 inches of snow but 51.4 inches of rain, residents should focus on flood prep rather than winter weather. The 54 extreme heat days require efficient cooling systems and shade structures. Summer gear should prioritize moisture-wicking fabrics.
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.