Peoria County (Peoria)
September
Weather in Peoria County, Illinois for September 2025
Your guide to Peoria County weather in September - trends and predictions
Until now, September 2025 in Peoria County is slightly cooler than the historical average by -0.7 °F.
The forecast for the next days in Peoria County predicts temperatures to be around 26 °F, close to the historical average.
In general, the average temperature in Peoria County at the beginning of September is 25 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 23.6 °F by the end of September.
With an average of 3 rainy days, Peoria County experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
27
Dry days
3
Rainy days
0
Snow days
27°/14°
Temperatures
19 km/h
Avg max wind
60 %
Avg humidity
Peoria County Weather September
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Temperatures trend during September in Peoria County
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September weather in Peoria County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 27° /12° | 0 mm | 7 | |
| Sept. 2 | Sunny | 25° /11° | 0 mm | 6 | |
| Sept. 3 |  Partly cloudy | 27° /12° | 29 mm | 7 | |
| Sept. 4 | Sunny | 26° /10° | 0 mm | 6 | |
| Sept. 5 |  Mist | 27° /15° | 0 mm | 6 | |
| Sept. 6 | Partly cloudy | 22° /9° | 0 mm | 6 | |
| Sept. 7 | Sunny | 21° /5° | 0 mm | 6 | |
| Sept. 8 | Sunny | 24° /6° | 0 mm | 6 | |
| Sept. 9 | Sunny | 27° /9° | 0 mm | 6 | |
| Sept. 10 | Sunny | 30° /12° | 0 mm | 8 | |
| Sept. 11 | Sunny | 32° /15° | 0 mm | 8 | |
| Sept. 12 | Sunny | 32° /15° | 0 mm | 8 | |
| Sept. 13 |  Overcast | 31° /18° | 0 mm | 7 | |
| Sept. 14 |  Patchy rain possible | 34° /18° | 0 mm | 8 | |
| Sept. 15 |  Cloudy | 32° /19° | 0 mm | 7 | |
| Sept. 16 | Sunny | 33° /18° | 0 mm | 8 | |
| Sept. 17 | Sunny | 30° /13° | 0 mm | 8 | |
| Sept. 18 | Sunny | 35° /15° | 0 mm | 1.4 | |
| Sept. 19 | Patchy rain possible | 34° /15° | 3 mm | 1 | |
| Sept. 20 | Overcast | 28° /17° | 0 mm | 1.3 | |
| Sept. 21 | Patchy rain possible | 25° /19° | 4.7 mm | 1 | |
| Sept. 22 |  Moderate rain | 28° /18° | 11.6 mm | 0 | |
| Sept. 23 | Patchy rain possible | 28° /17° | 3.1 mm | 5 | |
| Sept. 24 | Patchy rain possible | 24° /14° | 0.9 mm | 4 | |
| Sept. 25 | Patchy rain possible | 21° /12° | 2.8 mm | 4 | |
| Sept. 26 | Partly cloudy | 24° /13° | 0.1 mm | 5 | |
| Sept. 27 | Patchy rain possible | 24° /14° | 0 mm | 4 | |
| Sept. 28 | Patchy rain possible | 30° /16° | 0.7 mm | 5 | |
| Sept. 29 | Sunny | 23° /12° | 0 mm | 5 | |
| Sept. 30 | Partly cloudy | 19° /11° | 0.1 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Peoria 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 Peoria County forecast closer to your planned date for the most up-to-date weather information.
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Peoria County in September - FAQ
What are the expected maximum and minimum temperatures in Peoria County during September?
Enjoy moderate daytime temperatures of up to 27° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Peoria County during September?
Moderate rainfall is anticipated in Peoria County during September, with a total of 50.4 mm spread over approximately 3 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Peoria County during September?
The average wind speed in Peoria County during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Peoria County
Explore the daily rainfall trends and prepare for Peoria Countys September weather 💧
UV exposure in Peoria County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Peoria County?Get accurate weather forecasts for Peoria County, located at latitude 40.694 and longitude -89.589. Stay updated with localized weather information tailored for Peoria County.
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