Iowa (Des Moines)
September
Weather in Iowa for September 2025
Your guide to Iowa weather in September - trends and predictions
Until now, September 2025 in Iowa is cooler than usual, with temperatures averaging 24.6 °F, this is -4.5 °F below the typical seasonal average.
The forecast for the upcoming days in Iowa predicts a temperature of 30.4 °F, which is slightly above the historical average.
In general, the average temperature in Iowa at the beginning of September is 28.1 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 33.9 °F by the end of September.
Iowa experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 71.3 mm.
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Temperatures
Rain 🌧️
More
23
Dry days
7
Rainy days
0
Snow days
29°/14°
Temperatures
21 km/h
Avg max wind
57 %
Avg humidity
Iowa Weather September
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What’s the Weather Like in Iowa This September?
Discover the average temperatures and weather trends across Iowa’s cities this September.
Temperatures trend during September in Iowa
See the weather trend as well as the moving average line
September weather in Iowa day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 29° /13° | 0 mm | 7 | |
| Sept. 2 | Sunny | 30° /12° | 0 mm | 7 | |
| Sept. 3 | Sunny | 29° /13° | 22.2 mm | 7 | |
| Sept. 4 |  Mist | 30° /13° | 0 mm | 7 | |
| Sept. 5 |  Thundery outbreaks possible | 31° /17° | 0.5 mm | 7 | |
| Sept. 6 |  Overcast | 24° /11° | 0 mm | 6 | |
| Sept. 7 | Sunny | 24° /7° | 0 mm | 6 | |
| Sept. 8 |  Cloudy | 28° /10° | 0 mm | 7 | |
| Sept. 9 |  Partly cloudy | 31° /12° | 0 mm | 8 | |
| Sept. 10 | Overcast | 30° /16° | 0.4 mm | 7 | |
| Sept. 11 |  Heavy rain | 30° /16° | 9 mm | 7 | |
| Sept. 12 | Sunny | 32° /14° | 0 mm | 7 | |
| Sept. 13 | Partly cloudy | 31° /16° | 0 mm | 7 | |
| Sept. 14 | Partly cloudy | 32° /15° | 0 mm | 8 | |
| Sept. 15 |  Patchy rain possible | 32° /21° | 3.6 mm | 1.3 | |
| Sept. 16 | Patchy rain possible | 34° /20° | 0.2 mm | 1.3 | |
| Sept. 17 |  Moderate rain | 32° /20° | 7.3 mm | 1.2 | |
| Sept. 18 | Patchy rain possible | 28° /18° | 4.9 mm | 0.8 | |
| Sept. 19 | Moderate rain | 22° /17° | 5.8 mm | 0 | |
| Sept. 20 | Patchy rain possible | 21° /15° | 4.5 mm | 4 | |
| Sept. 21 | Fog | 25° /15° | 0 mm | 4 | |
| Sept. 22 | Sunny | 30° /16° | 0 mm | 6 | |
| Sept. 23 | Sunny | 29° /17° | 0 mm | 6 | |
| Sept. 24 | Sunny | 35° /17° | 0 mm | 6 | |
| Sept. 25 | Sunny | 36° /23° | 0 mm | 7 | |
| Sept. 26 | Sunny | 36° /22° | 0 mm | 7 | |
| Sept. 27 | Sunny | 34° /20° | 0 mm | 7 | |
| Sept. 28 | Sunny | 32° /18° | 0 mm | 6 | |
| Sept. 29 | Partly cloudy | 32° /14° | 0 mm | 8 | |
| Sept. 30 |  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.
Change Month
Iowa in September - FAQ
What are the expected maximum and minimum temperatures in Iowa during September?
Enjoy moderate daytime temperatures of up to 29° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Iowa during September?
Moderate rainfall is anticipated in Iowa during September, with a total of 71.3 mm spread over approximately 7 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 ☀️
Counties in Iowa
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Top locations in Iowa
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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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