Sumter County Climate
Sumter County, South Carolina
Avg Annual Temp
63.2°F
Annual Precip
47.5"
Annual Snowfall
0.6"
Extreme Heat Days
55.55
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Sumter County Weather
Warm and Sunny Midlands Climate
Sumter County averages 63.2°F annually, which is roughly 9 degrees higher than the U.S. median. Precipitation is consistent with the region at 47.5 inches per year. The humid subtropical climate ensures a long outdoor season and very mild winters.
Right in Line With State Averages
Sumter's annual average of 63.2°F is nearly identical to the South Carolina average of 62.8°F. Its rainfall of 47.5 inches is also very close to the state's 48.9-inch average. Sumter represents the quintessential climate of the South Carolina inner coastal plain.
Slightly Cooler Than its Neighbors
Sumter is slightly cooler than Richland (63.9°F) and Orangeburg (65.3°F) to the west and south. Interestingly, it has fewer extreme heat days (56) than both Richland (84) and Orangeburg (80). This provides a marginally more tempered summer experience than neighboring counties.
Hot Summers and Very Rare Snow
Summers are hot with 56 days reaching 90°F or more and a July average of 80.3°F. Snow is almost a non-factor, averaging only 0.6 inches per year. Winters are pleasant and mild, with temperatures averaging 47.0°F during the winter months.
Prioritize Sun Protection and AC
With 56 days of high heat, maintaining a reliable cooling system and using sun protection is vital. Residents only need light winter gear for the 45.2°F January average, as 0.6 inches of snow rarely impacts travel. The 47.5 inches of rain is well-distributed, but gardeners should plan for summer dry spells.
Frequently Asked Questions
What is the average temperature in Sumter County?
How much rain does Sumter County get?
Does it snow in Sumter County?
How hot does Sumter County get in summer?
How cold are winters in Sumter County?
Track your own weather in Sumter County
Ambient Weather personal weather stations give you hyperlocal climate data.
Sponsored
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.