Iowa City (IA)
September
Weather in Iowa City, Iowa for September 2025
Your guide to Iowa City weather in September - trends and predictions
Expect cooler weather in first days of September 2025 in Iowa City with the forecast suggesting a temperature of 24.8 °F, lower than the historical average.
In general, the average temperature in Iowa City at the beginning of September is 26.1 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 24.6 °F by the end of September.
With an average of 5 rainy days, Iowa City experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
25
Dry days
5
Rainy days
0
Snow days
26°/13°
Temperatures
17 km/h
Avg max wind
64 %
Avg humidity
Iowa City Weather September
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Temperatures trend during September in Iowa City
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September weather in Iowa City day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Partly cloudy | 26° /16° | 0 mm | 5 | |
| Sept. 2 |  Sunny | 29° /17° | 0 mm | 6 | |
| Sept. 3 |  Patchy rain possible | 26° /18° | 3.3 mm | 5 | |
| Sept. 4 | Patchy rain possible | 30° /19° | 2.4 mm | 5 | |
| Sept. 5 |  Mist | 27° /18° | 0.1 mm | 5 | |
| Sept. 6 | Partly cloudy | 21° /16° | 0 mm | 5 | |
| Sept. 7 | Patchy rain possible | 24° /19° | 4.2 mm | 5 | |
| Sept. 8 | Sunny | 23° /7° | 0 mm | 6 | |
| Sept. 9 | Sunny | 27° /12° | 0 mm | 7 | |
| Sept. 10 | Sunny | 28° /13° | 0 mm | 7 | |
| Sept. 11 | Sunny | 30° /14° | 0 mm | 8 | |
| Sept. 12 | Sunny | 30° /16° | 0 mm | 8 | |
| Sept. 13 |  Overcast | 25° /17° | 0.1 mm | 6 | |
| Sept. 14 | Partly cloudy | 30° /17° | 0 mm | 8 | |
| Sept. 15 |  Cloudy | 29° /19° | 0 mm | 6 | |
| Sept. 16 | Sunny | 30° /18° | 0 mm | 8 | |
| Sept. 17 | Sunny | 30° /15° | 0 mm | 8 | |
| Sept. 18 | Overcast | 29° /15° | 0 mm | 6 | |
| Sept. 19 | Overcast | 29° /17° | 17.2 mm | 6 | |
| Sept. 20 | Overcast | 30° /19° | 0.4 mm | 7 | |
| Sept. 21 | Patchy rain possible | 30° /17° | 0.1 mm | 7 | |
| Sept. 22 |  Moderate or heavy rain shower | 21° /14° | 15.5 mm | 5 | |
| Sept. 23 | Partly cloudy | 21° /8° | 1.1 mm | 6 | |
| Sept. 24 | Patchy rain possible | 20° /12° | 0.2 mm | 5 | |
| Sept. 25 | Overcast | 24° /10° | 0 mm | 5 | |
| Sept. 26 | Sunny | 26° /11° | 0 mm | 7 | |
| Sept. 27 | Partly cloudy | 24° /12° | 0 mm | 6 | |
| Sept. 28 | Sunny | 26° /13° | 0 mm | 7 | |
| Sept. 29 | Sunny | 26° /13° | 0 mm | 7 | |
| Sept. 30 | Overcast | 26° /14° | 0 mm | 6 | |
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Important Notice
Our weather forecast for Iowa City 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 City forecast closer to your planned date for the most up-to-date weather information.
Change Month
Iowa City in September - FAQ
What are the expected maximum and minimum temperatures in Iowa City during September?
Enjoy moderate daytime temperatures of up to 26° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Iowa City during September?
In September, Iowa City can expect light to moderate rainfall, totaling 35 mm across approximately 5 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Iowa City during September?
The average wind speed in Iowa City during September is 17 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Iowa City
Explore the daily rainfall trends and prepare for Iowa Citys September weather 💧
UV exposure in Iowa City during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Iowa City?Get accurate weather forecasts for Iowa City, located at latitude 41.661 and longitude -91.53. Stay updated with localized weather information tailored for Iowa City.
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