Decatur Weather in September

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

September is in the fall / autumn in Decatur and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a muggy 28°C (83°F), whilst at night 16°C (60°F) is normal.

On average September is the 4th driest month of the year in Decatur with around 105mm 4.1 inches of rain making it a damp time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.

On the flip side this corresponds to an average of 8 hours of sunshine per day.

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 Decatur in September 2025.