Weather in Polk County, Iowa for September 2026
Until now, September 2026 in Polk County 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 Polk County with the forecast suggesting a temperature of 17 °F, lower than the historical average.
In general, the average temperature in Polk County 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 Polk County 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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Polk County Weather September
Temperatures trend during September in Polk County
September weather in Polk County day by day
| 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 | |
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Polk County in September - FAQ
What are the expected maximum and minimum temperatures in Polk County during September?
How much rainfall should be expected in Polk County during September?
What are the typical wind conditions in Polk County during September?
September rainfall patterns in Polk County
UV exposure in Polk County during 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.