Marion County Climate
Marion County, South Carolina
Avg Annual Temp
62.5°F
Annual Precip
51.3"
Annual Snowfall
—
Extreme Heat Days
54.55
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Marion County Weather
A Warm and High-Precipitation Climate
Marion County's 62.5°F annual average temperature sits well above the U.S. median. The county is particularly wet, receiving 51.3 inches of rain compared to the national average of 38 inches.
Aligning with Coastal Plain Norms
The county's 62.5°F average is almost identical to the South Carolina state average of 62.8°F. However, Marion receives 51.3 inches of rain, which is wetter than the 48.9-inch state average.
Drier and Warmer than Coastal Horry
Marion County is slightly drier than neighboring Horry County, which gets 52.4 inches of rain. Marion also sees 55 extreme heat days, significantly more than the 34 days recorded in coastal Horry.
Hot Summers and Very Mild Winters
July brings an average temperature of 80.4°F, and the county faces 55 days of extreme heat annually. Winter temperatures average a mild 46.1°F, and snowfall is essentially non-existent in the climate record.
Water Management and Heat Relief
With over 51 inches of rain, keeping gutters clear and ensuring proper yard grading is vital to prevent flooding. Homeowners should also prepare for 55 days of 90°F heat with regular air conditioning maintenance.
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.