Chattanooga Weather in September

What's the weather like in Chattanooga (Tennessee) in September 2025?

The climate in Chattanooga during September can be summarized as warm, humid and damp.

September is in the fall / autumn in Chattanooga and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a muggy 28°C (82°F), whilst at night 16°C (61°F) is normal.

Chattanooga weather averages (imperial / metric)
Daytime temperature 27.7°C 81.9°F
Nightly temperature 16.3°C 61.3°F
Average temperature 22°C 71.6°F
Daily sunshine 8.1 hrs
Avg rainfall 105 mm 4.1 ins
Rainy days 9 days
Sea temperature 24.7°C 76.5°F
Humidity 77%
Windspeed 9.4kph 6 mph

On average September is the 4th driest month of the year in Chattanooga with around 105mm 4.1 inches of rain making it a damp 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 8.1 hours of sunshine per day.

September temperatures in Chattanooga

Chattanooga average temperature in September

September rainfall

Chattanooga average rain in September

September hourly sunshine

Chattanooga 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 Chattanooga 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

Chattanooga weather stats

Chattanooga weather statistics
Hottest month: July 31.2°C 88.2°F
Driest month: October 83mm 3.3ins
Sunniest month: June 9.8hrs
Coldest month: January 7.9°C 46.2°F
Wettest month: March 155mm 6.1ins
Map showing location of Chattanooga (35.04563, -85.30968) Chattanooga map pin © Google

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