Sumter (SC) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Sumter.
Climate overview of Sumter
Sumter, South Carolina, United States of America, sees big temperature differences between seasons, with July peaking at 33°C (91°F) and January dropping to 13°C (55°F).
Rain/snowfall is high, totalling around 1223 mm (48 in) per year. July is the wettest month and January the driest. The city also experiences very warm summers and mild winters.
Sumter Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Sumter - and find the best time to visit.
Monthly Temperature in Sumter
Visitors to Sumter can expect significant temperature changes throughout the year. Average maximum daytime temperatures range from a very warm 33°C (91°F) in July, the warmest time of the year, to a moderate 13°C (55°F) during cooler months like January.
At night, you can expect temperatures ranging from 21°C (70°F) in July to around 0°C (32°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Sumter
Sumter is known for its substantial rain/snowfall, with annual precipitation reaching 1223 mm (48 in). While rainfall varies throughout the year, each season offers its own charm. July brings wetter days averaging 140 mm (5.5 in) of precipitation, spread over 12 rainy days.
In contrast, the driest month January experiences a drier climate, with about 68 mm (2.7 in) of rainfall spread across 11 rainy days. For more details, please visit our Sumter Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Sumter
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: April and May
- Warmest weather: June, July and August
- Fewest rainy days: March, October and November
- Seasonal pattern: Very warm summers and mild winters
Frequently asked questions about the climate in Sumter
What is the best time to visit Sumter?
April and May typically offer the most optimal weather in Sumter. In contrast, July tends to have less optimal conditions. Sumter has very warm summers and mild winters.
What temperatures can I expect in Sumter?
Daytime highs range from 13°C (55°F) in January to 33°C (91°F) in July. Nighttime lows range from 0°C (32°F) to 21°C (70°F). Temperatures vary considerably through the year.
How much rain does Sumter get?
Annual rainfall is around 1223 mm (48 in). July is the wettest month with 140 mm (5.5 in), while January is the driest with 68 mm (2.7 in).
Sumter 3-Day Forecast
Sumter (SC) 3-Day Forecast
Sumter on the map
Sumter is highlighted - select any city to see its climate.
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