Polk County (Des Moines)
September
Weather in Polk County for September 2025
Your guide to Polk County weather in September - trends and predictions
In general, the average temperature in Polk County 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.
Polk County 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
Polk County 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 Polk County
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 Polk County 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 Polk County forecast closer to your planned date for the most up-to-date weather information.
Polk County in September - FAQ
What are the expected maximum and minimum temperatures in Polk County 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 Polk County during September?
Moderate rainfall is anticipated in Polk County 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 Polk County during September?
The average wind speed in Polk County during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Polk County
Explore the daily rainfall trends and prepare for Polk Countys September weather 💧
UV exposure in Polk County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Polk County?Get accurate weather forecasts for Polk County, located at latitude 41.601 and longitude -93.609. Stay updated with localized weather information tailored for Polk County.
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