Marion County Climate
Marion County, South Carolina
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
62.5°F
Annual Precip
51.3"
Annual Snowfall
—
Extreme Heat Days
55
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8b
Minimum winter temperature range for plant survival
5,302
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Marion County
Climate Verdict
Marion County has a warm, averaging 62.5°F year-round, moderately wet with 51.3 inches of annual precipitation, occasional hot days — 54.55 per year above 90°F. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 44.0°F. summers are hot, with July averaging 80.4°F. The 36°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
The moderate temperatures support hiking, cycling, and camping comfortably in spring, summer, and fall.
Regional Context
Marion County closely matches the South Carolina statewide average temperature of 62.8°F, it is somewhat wetter than average for South Carolina.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.