Summerville (SC) Weather & Climate: Best Time to Visit

Depending on the time of the year, temperatures range from very warm to moderate in Summerville. Average daytime temperatures reach a very warm 33°C (91°F) in July. In January, the coolest month of the year, temperatures drop to a moderate 15°C (59°F).

At night, temperatures range from around 22°C (72°F) in July to 2°C (36°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Summerville has a relatively rain/snowy climate with high precipitation levels, averaging 1317 mm (52 in) of rain/snowfall annually. Summerville experiences moderate seasonal variation in rainfall, with monthly averages ranging from 153 mm (6 in) in August, the wettest month, and 72 mm (2.8 in) in January, the driest month. For more details, please visit our Summerville Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Summerville can be enjoyed more throughout the sunniest month of May under a blue sky, with approximately 9.8 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 5.7 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Summerville.

The city experiences its highest humidity in August, reaching 79%. In February, the humidity drops to its lowest level at 67%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year