Summerville Weather in September

What's the weather like in Summerville (South Carolina) in September 2025?

The climate in Summerville during September can be summarized as hot, humid and wet.

September is in the fall / autumn in Summerville and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a muggy 30°C (85°F), whilst at night 18°C (64°F) is normal.

Summerville weather averages (imperial / metric)
Daytime temperature 29.6°C 85.2°F
Nightly temperature 17.9°C 64.1°F
Average temperature 23.7°C 74.7°F
Daily sunshine 7.9 hrs
Avg rainfall 121 mm 4.8 ins
Rainy days 9 days
Sea temperature 27.3°C 81.1°F
Humidity 78%
Windspeed 12.2kph 8 mph

On average September is the 4th wettest month of the year in Summerville with around 121mm 4.8 inches of rain making it a wet time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 7.9 hours of sunshine per day.

September temperatures in Summerville

Summerville average temperature in September

September rainfall

Summerville average rain in September

September hourly sunshine

Summerville average rain in September

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Summerville in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Summerville weather stats

Summerville weather statistics
Hottest month: July 32.3°C 90.1°F
Driest month: November 62mm 2.4ins
Sunniest month: April 9.7hrs
Coldest month: January 13.7°C 56.7°F
Wettest month: August 167mm 6.6ins
Map showing location of Summerville (33.0185, -80.17565) Summerville map pin © Google

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