Des Moines Weather in September

What's the weather like in Des Moines (Iowa) in September 2025?

The climate in Des Moines during September can be summarized as warm and a little damp.

September is in the fall / autumn in Des Moines and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (76°F), whilst at night 12°C (53°F) is normal.

Des Moines weather averages (imperial / metric)
Daytime temperature 24.3°C 75.7°F
Nightly temperature 11.9°C 53.4°F
Average temperature 18.1°C 64.6°F
Daily sunshine 8.6 hrs
Avg rainfall 91 mm 3.6 ins
Rainy days 9 days
Sea temperature 18.9°C 66°F
Humidity 71%
Windspeed 15.8kph 10 mph

On average September is the 5th wettest month of the year in Des Moines with around 91mm 3.6 inches of rain making it a a little 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 8.6 hours of sunshine per day.

September temperatures in Des Moines

Des Moines average temperature in September

September rainfall

Des Moines average rain in September

September hourly sunshine

Des Moines 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 Des Moines 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

Des Moines weather stats

Des Moines weather statistics
Hottest month: July 30.1°C 86.2°F
Driest month: January 24mm 0.9ins
Sunniest month: July 11.6hrs
Coldest month: January -2.3°C 27.9°F
Wettest month: June 115mm 4.5ins
Map showing location of Des Moines (41.60054, -93.60911) Des Moines map pin © Google

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