Olathe Weather in September

The climate in Olathe during September can be summarized as warm, humid and wet.

September is in the fall / autumn in Olathe and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a muggy 27°C (80°F), whilst at night 15°C (58°F) is normal.

On average September is the 3rd wettest month of the year in Olathe with around 127mm 5 inches of rain making it a wet 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 8.5 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 Olathe in September 2025.