Iowa (Des Moines)
September
Weather in Iowa for September 2026
Your guide to Iowa weather in September - trends and predictions
Until now, September 2026 in Iowa has been nearly identical to the historical average, with a temperature of 29.6 °F (showing only a slight deviation of 0.1 °F).
Expect cooler weather in the next days in Iowa with the forecast suggesting a temperature of 17 °F, lower than the historical average.
In general, the average temperature in Iowa at the beginning of September is 30 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.9 °F by the end of September.
The climate of Iowa in September is notably wet, with an average of 11 rainy days, and a total of 128.5 mm of precipitation.
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Temperatures
Rain 🌧️
More
19
Dry days
11
Rainy days
0
Snow days
28°/14°
Temperatures
20 km/h
Avg max wind
63 %
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 | 31° /15° | 0 mm | 7 | |
| Sept. 2 | Sunny | 32° /14° | 0 mm | 8 | |
| Sept. 3 | Sunny | 31° /15° | 16.7 mm | 7 | |
| Sept. 4 | Sunny | 32° /15° | 0 mm | 7 | |
| Sept. 5 |  Thundery outbreaks possible | 32° /18° | 0.4 mm | 7 | |
| Sept. 6 | Sunny | 27° /13° | 3.2 mm | 6 | |
| Sept. 7 | Sunny | 25° /10° | 13.5 mm | 5 | |
| Sept. 8 |  Cloudy | 30° /12° | 0.7 mm | 6 | |
| Sept. 9 |  Partly cloudy | 30° /14° | 21.1 mm | 7 | |
| Sept. 10 |  Overcast | 30° /16° | 0.3 mm | 7 | |
| Sept. 11 | Overcast | 30° /15° | 6.8 mm | 7 | |
| Sept. 12 | Sunny | 30° /14° | 0.6 mm | 7 | |
| Sept. 13 | Partly cloudy | 28° /15° | 4.3 mm | 6 | |
| Sept. 14 | Partly cloudy | 31° /14° | 3.3 mm | 6 | |
| Sept. 15 | Partly cloudy | 29° /17° | 4.9 mm | 6 | |
| Sept. 16 |  Fog | 28° /16° | 3.4 mm | 5 | |
| Sept. 17 | Cloudy | 27° /15° | 8.5 mm | 5 | |
| Sept. 18 | Mist | 28° /15° | 11.2 mm | 5 | |
| Sept. 19 |  Heavy rain at times | 28° /17° | 7.7 mm | 5 | |
| Sept. 20 | Overcast | 17° /15° | 11.6 mm | 0.9 | |
| Sept. 21 |  Patchy rain possible | 14° /12° | 1.5 mm | 0.7 | |
| Sept. 22 | Patchy rain possible | 12° /10° | 0.5 mm | 0.7 | |
| Sept. 23 | Mist | 18° /9° | 0 mm | 6 | |
| Sept. 24 | Overcast | 17° /12° | 0.7 mm | 2.6 | |
| Sept. 25 | Patchy rain possible | 16° /12° | 7.4 mm | 3 | |
| Sept. 26 | Overcast | 21° /13° | 1.5 mm | 6 | |
| Sept. 27 | Sunny | 22° /13° | 0 mm | 6 | |
| Sept. 28 | Sunny | 23° /13° | 0 mm | 6 | |
| Sept. 29 | Overcast | 17° /15° | 4 mm | 4 | |
| Sept. 30 | Mist | 16° /9° | 0.5 mm | 4 | |
| Next | |||||
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.
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Iowa in September - FAQ
What are the expected maximum and minimum temperatures in Iowa during September?
Enjoy moderate daytime temperatures of up to 28° 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?
Significant rainfall exceeding 128.5 mm is expected in Iowa during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Iowa during September?
The average wind speed in Iowa during September is 20 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 💧
Typically, Iowa has 11 rainy days in September with a total of 128.5 mm of rainfall.
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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