Mankato Weather in September

What's the weather like in Mankato (Kansas) in September 2025?

The climate in Mankato during September can be summarized as warm and reasonably dry.

September is in the fall / autumn in Mankato and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a comfortable 26°C (79°F), whilst at night 12°C (54°F) is normal.

Mankato weather averages (imperial / metric)
Daytime temperature 26.3°C 79.3°F
Nightly temperature 12°C 53.5°F
Average temperature 19.1°C 66.4°F
Daily sunshine 9.4 hrs
Avg rainfall 73 mm 2.9 ins
Rainy days 8 days
Sea temperature 19.4°C 67°F
Humidity 67%
Windspeed 19.1kph 12 mph

On average September is the 5th wettest month of the year in Mankato with around 73mm 2.9 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 9.4 hours of sunshine per day.

September temperatures in Mankato

Mankato average temperature in September

September rainfall

Mankato average rain in September

September hourly sunshine

Mankato 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 Mankato 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

Mankato weather stats

Mankato weather statistics
Hottest month: July 32.6°C 90.7°F
Driest month: January 14mm 0.6ins
Sunniest month: July 12.3hrs
Coldest month: January 2.2°C 36°F
Wettest month: May 106mm 4.2ins
Map showing location of Mankato (39.78723, -98.21005) Mankato map pin © Google

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