Champaign (IL)
September
Weather in Champaign, Illinois for September 2026
Your guide to Champaign weather in September - trends and predictions
In general, the average temperature in Champaign at the beginning of September is 23.1 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 26.9 °F by the end of September.
Champaign experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 96.5 mm.
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Temperatures
Rain 🌧️
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22
Dry days
8
Rainy days
0
Snow days
27°/14°
Temperatures
16 km/h
Avg max wind
70 %
Avg humidity
Champaign Weather September
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Temperatures trend during September in Champaign
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September weather in Champaign day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Partly cloudy | 27° /9° | 0 mm | 7 | |
| Sept. 2 | Partly cloudy | 27° /11° | 0 mm | 7 | |
| Sept. 3 |  Fog | 25° /14° | 3.3 mm | 6 | |
| Sept. 4 | Mist | 20° /11° | 1.6 mm | 5 | |
| Sept. 5 |  Overcast | 20° /10° | 0 mm | 5 | |
| Sept. 6 | Mist | 21° /9° | 0 mm | 5 | |
| Sept. 7 |  Sunny | 22° /7° | 0 mm | 6 | |
| Sept. 8 | Sunny | 24° /7° | 0 mm | 6 | |
| Sept. 9 | Overcast | 23° /8° | 0 mm | 5 | |
| Sept. 10 |  Cloudy | 27° /13° | 0 mm | 6 | |
| Sept. 11 | Overcast | 27° /15° | 0 mm | 6 | |
| Sept. 12 | Overcast | 30° /13° | 0 mm | 7 | |
| Sept. 13 |  Thundery outbreaks possible | 27° /18° | 0 mm | 6 | |
| Sept. 14 | Thundery outbreaks possible | 35° /20° | 0 mm | 8 | |
| Sept. 15 | Mist | 31° /21° | 0 mm | 7 | |
| Sept. 16 | Sunny | 31° /14° | 0 mm | 8 | |
| Sept. 17 | Overcast | 28° /15° | 0 mm | 6 | |
| Sept. 18 | Overcast | 29° /16° | 0 mm | 6 | |
| Sept. 19 | Thundery outbreaks possible | 31° /15° | 9 mm | 7 | |
| Sept. 20 | Fog | 28° /18° | 7.5 mm | 6 | |
| Sept. 21 |  Heavy rain | 23° /18° | 41 mm | 5 | |
| Sept. 22 |  Light rain shower | 27° /16° | 7.3 mm | 6 | |
| Sept. 23 | Fog | 27° /19° | 4.6 mm | 6 | |
| Sept. 24 | Light rain shower | 21° /18° | 22.2 mm | 5 | |
| Sept. 25 | Overcast | 23° /14° | 0 mm | 5 | |
| Sept. 26 | Mist | 24° /11° | 0 mm | 5 | |
| Sept. 27 | Sunny | 29° /13° | 0 mm | 7 | |
| Sept. 28 | Sunny | 31° /15° | 0 mm | 8 | |
| Sept. 29 | Sunny | 31° /15° | 0 mm | 8 | |
| Sept. 30 | Cloudy | 29° /16° | 0 mm | 6 | |
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Important Notice
Our weather forecast for Champaign 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 Champaign forecast closer to your planned date for the most up-to-date weather information.
Change Month
Champaign in September - FAQ
What are the expected maximum and minimum temperatures in Champaign 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 Champaign during September?
Moderate rainfall is anticipated in Champaign during September, with a total of 96.5 mm spread over approximately 8 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Champaign during September?
The average wind speed in Champaign during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Champaign
Explore the daily rainfall trends and prepare for Champaigns September weather 💧
UV exposure in Champaign during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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