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Weather in Iowa for September 2025

Your guide to Iowa weather in September - trends and predictions
  • In general, the average temperature in Iowa at the beginning of September is 31.4 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 28.4 °F by the end of September.

  • Iowa sees moderate rainfall in September, averaging 10 rainy days.

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Average dry days
20
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
31°/13°
Temperatures
Average wind speed
21 km/h
Avg max wind
Average humidity
57 %
Avg humidity

Iowa in September average weather

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Temperatures trend during September in Iowa

See the weather trend as well as the moving average line

September weather day by day

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Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
31° /12° 0 mm 8
Sept. 2 Sunny
Sunny
33° /12° 0 mm 9
Sept. 3 Sunny
Sunny
34° /13° 0 mm 9
Sept. 4 Mist
Mist
34° /15° 0 mm 8
Sept. 5 Thundery outbreaks possible
Thundery outbreaks possible
35° /20° 0.8 mm 8
Sept. 6 Overcast
Overcast
27° /13° 0 mm 6
Sept. 7 Mist
Mist
26° /7° 0 mm 7
Sept. 8 Cloudy
Cloudy
30° /10° 0 mm 7
Sept. 9 Partly cloudy
Partly cloudy
33° /11° 0 mm 8
Sept. 10 Overcast
Overcast
32° /16° 0.2 mm 8
Sept. 11 Heavy rain
Heavy rain
30° /15° 13.5 mm 7
Sept. 12 Mist
Mist
30° /13° 0 mm 7
Sept. 13 Partly cloudy
Partly cloudy
28° /14° 0 mm 7
Sept. 14 Partly cloudy
Partly cloudy
30° /12° 0 mm 8
Sept. 15 Overcast
Overcast
30° /16° 0 mm 7
Sept. 16 Fog
Fog
29° /15° 0.2 mm 7
Sept. 17 Cloudy
Cloudy
27° /12° 0 mm 6
Sept. 18 Mist
Mist
30° /12° 0 mm 7
Sept. 19 Thundery outbreaks possible
Thundery outbreaks possible
30° /17° 2.9 mm 7
Sept. 20 Thundery outbreaks possible
Thundery outbreaks possible
30° /16° 3 mm 7
Sept. 21 Partly cloudy
Partly cloudy
29° /14° 27.5 mm 7
Sept. 22 Light rain shower
Light rain shower
24° /13° 16.6 mm 5
Sept. 23 Patchy rain possible
Patchy rain possible
26° /11° 4.2 mm 6
Sept. 24 Fog
Fog
25° /11° 0.4 mm 6
Sept. 25 Fog
Fog
28° /11° 0 mm 6
Sept. 26 Cloudy
Cloudy
27° /13° 0 mm 7
Sept. 27 Fog
Fog
26° /12° 0 mm 6
Sept. 28 Mist
Mist
29° /13° 0 mm 6
Sept. 29 Partly cloudy
Partly cloudy
32° /14° 0 mm 8
Sept. 30 Patchy light rain with thunder
Patchy light rain with thunder
32° /15° 2 mm 7
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Important Notice
Our weather forecast for Iowa in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Iowa forecast closer to your planned date for the most up-to-date weather information.

Iowa in September - FAQ

What are the expected maximum and minimum temperatures in Iowa during September?
Expect warm days with temperatures around 31°, cooling to mild conditions of 13° after sunset. Perfect for those who enjoy warm weather.
How much rainfall should be expected in Iowa during September?
Moderate rainfall is anticipated in Iowa during September, with a total of 58.7 mm spread over approximately 10 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Iowa during September?
The average wind speed in Iowa during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Iowa

Explore the daily rainfall trends and prepare for Iowas September weather 💧

UV exposure in Iowa during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Location coordinates Where is Iowa?

Get accurate weather forecasts for Iowa, located at latitude 41.601 and longitude -93.609. Stay updated with localized weather information tailored for Iowa.

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