Rolla Weather in September

The climate in Rolla during September can be summarized as mild and reasonably dry.

September is in the fall / autumn in Rolla and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 19°C (65°F), whilst at night 5°C (41°F) is normal.

On average September is the 5th wettest month of the year in Rolla with around 51mm 2 inches of rain making it a reasonably dry 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 7.1 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 Rolla in September 2025.