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 sees moderate rainfall in September, averaging 10 rainy days.
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20
Dry days
10
Rainy days
0
Snow days
31°/13°
Temperatures
21 km/h
Avg max wind
57 %
Avg humidity
Iowa in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  31° | 2 33° | 3 34° | 4  34° | 5  35° | 6  27° | 7 26° |
| 8  30° | 9  33° | 10 32° | 11  30° | 12 30° | 13 28° | 14 30° |
| 15 30° | 16 29° | 17 27° | 18 30° | 19 30° | 20 30° | 21 29° |
| 22  24° | 23 26° | 24 25° | 25 28° | 26 27° | 27 26° | 28 29° |
| 29 32° | 30  32° |
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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 | 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.
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
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UV exposure in Iowa during September
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