Cedar Rapids (IA)
September
Weather in Cedar Rapids, Iowa for September 2026
Your guide to Cedar Rapids weather in September - trends and predictions
Flood Watch - See hour by hour.
So far, September 2026 in Cedar Rapids is slightly warmer than the historical average by 0.7 °F.
The forecast for the next days in Cedar Rapids predicts temperatures to be around 18 °F, close to the historical average.
In general, the average temperature in Cedar Rapids at the beginning of September is 27.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.3 °F by the end of September.
With an average of 4 rainy days, Cedar Rapids experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
26
Dry days
4
Rainy days
0
Snow days
26°/14°
Temperatures
16 km/h
Avg max wind
75 %
Avg humidity
Cedar Rapids Weather September
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Temperatures trend during September in Cedar Rapids
See the weather trend as well as the moving average line
September weather in Cedar Rapids day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 30° /18° | 0 mm | 6 | |
| Sept. 2 |  Cloudy | 30° /18° | 0 mm | 7 | |
| Sept. 3 |  Moderate or heavy rain shower | 28° /17° | 12.7 mm | 6 | |
| Sept. 4 |  Mist | 28° /14° | 0 mm | 6 | |
| Sept. 5 |  Sunny | 28° /16° | 0 mm | 6 | |
| Sept. 6 | Overcast | 23° /12° | 0 mm | 4 | |
| Sept. 7 | Sunny | 24° /10° | 0 mm | 4 | |
| Sept. 8 | Cloudy | 28° /13° | 0 mm | 4 | |
| Sept. 9 | Overcast | 28° /16° | 207.8 mm | 5 | |
| Sept. 10 |  Thundery outbreaks possible | 26° /14° | 0 mm | 7 | |
| Sept. 11 | Fog | 27° /13° | 0 mm | 7 | |
| Sept. 12 | Mist | 28° /15° | 0 mm | 6 | |
| Sept. 13 | Thundery outbreaks possible | 28° /17° | 2 mm | 6 | |
| Sept. 14 | Thundery outbreaks possible | 29° /16° | 0.8 mm | 5 | |
| Sept. 15 | Fog | 26° /18° | 21.8 mm | 4 | |
| Sept. 16 |  Light rain shower | 25° /16° | 5.5 mm | 4 | |
| Sept. 17 | Sunny | 28° /16° | 4.5 mm | 5 | |
| Sept. 18 | Cloudy | 26° /17° | 2.1 mm | 4 | |
| Sept. 19 | Moderate or heavy rain shower | 26° /17° | 26.4 mm | 4 | |
| Sept. 20 | Patchy rain possible | 20° /14° | 10 mm | 1 | |
| Sept. 21 | Patchy rain possible | 14° /11° | 3.6 mm | 1.3 | |
| Sept. 22 | Light rain shower | 14° /10° | 7 mm | 3.5 | |
| Sept. 23 | Sunny | 19° /9° | 0 mm | 5.7 | |
| Sept. 24 | Overcast | 18° /12° | 0.3 mm | 4 | |
| Sept. 25 | Sunny | 20° /14° | 3.4 mm | 6 | |
| Sept. 26 | Sunny | 21° /13° | 0.1 mm | 5 | |
| Sept. 27 | Overcast | 22° /17° | 0 mm | 6 | |
| Sept. 28 | Overcast | 19° /7° | 8.2 mm | 2 | |
| Sept. 29 | Sunny | 13° /5° | 0 mm | 4 | |
| Sept. 30 | Sunny | 15° /9° | 0.3 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Cedar Rapids 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 Cedar Rapids forecast closer to your planned date for the most up-to-date weather information.
Change Month
Cedar Rapids in September - FAQ
What are the expected maximum and minimum temperatures in Cedar Rapids during September?
Enjoy moderate daytime temperatures of up to 26° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Cedar Rapids during September?
Significant rainfall exceeding 129.1 mm is expected in Cedar Rapids during September, occurring over more than 4 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Cedar Rapids during September?
The average wind speed in Cedar Rapids during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Cedar Rapids
Explore the daily rainfall trends and prepare for Cedar Rapidss September weather 💧
Typically, Cedar Rapids has 4 rainy days in September with a total of 129.1 mm of rainfall.
UV exposure in Cedar Rapids during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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