September
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 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 🌧️
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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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Temperatures trend during September in Iowa
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September weather in Iowa day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 31° /12° | 0 mm | 8 | |
| Sept. 2 | Sunny | 33° /12° | 0 mm | 9 | |
| Sept. 3 | Sunny | 34° /13° | 0 mm | 9 | |
| Sept. 4 |  Mist | 34° /15° | 0 mm | 8 | |
| Sept. 5 |  Thundery outbreaks possible | 35° /20° | 0.8 mm | 8 | |
| Sept. 6 |  Overcast | 27° /13° | 0 mm | 6 | |
| Sept. 7 | Mist | 26° /7° | 0 mm | 7 | |
| Sept. 8 |  Cloudy | 30° /10° | 0 mm | 7 | |
| Sept. 9 |  Partly cloudy | 33° /11° | 0 mm | 8 | |
| Sept. 10 | Overcast | 32° /16° | 0.2 mm | 8 | |
| Sept. 11 |  Heavy rain | 30° /15° | 13.5 mm | 7 | |
| Sept. 12 | Mist | 30° /13° | 0 mm | 7 | |
| Sept. 13 | Partly cloudy | 28° /14° | 0 mm | 7 | |
| Sept. 14 | Partly cloudy | 30° /12° | 0 mm | 8 | |
| Sept. 15 | Overcast | 30° /16° | 0 mm | 7 | |
| Sept. 16 | Fog | 29° /15° | 0.2 mm | 7 | |
| Sept. 17 | Cloudy | 27° /12° | 0 mm | 6 | |
| Sept. 18 | Mist | 30° /12° | 0 mm | 7 | |
| Sept. 19 | Thundery outbreaks possible | 30° /17° | 2.9 mm | 7 | |
| Sept. 20 | Thundery outbreaks possible | 30° /16° | 3 mm | 7 | |
| Sept. 21 | Partly cloudy | 29° /14° | 27.5 mm | 7 | |
| Sept. 22 |  Light rain shower | 24° /13° | 16.6 mm | 5 | |
| Sept. 23 | Patchy rain possible | 26° /11° | 4.2 mm | 6 | |
| Sept. 24 | Fog | 25° /11° | 0.4 mm | 6 | |
| Sept. 25 | Fog | 28° /11° | 0 mm | 6 | |
| Sept. 26 | Cloudy | 27° /13° | 0 mm | 7 | |
| Sept. 27 | Fog | 26° /12° | 0 mm | 6 | |
| Sept. 28 | Mist | 29° /13° | 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.
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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 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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