Chicago
September
Weather in Chicago for September 2025
Your guide to Chicago weather in September - trends and predictions
In general, the average temperature in Chicago at the beginning of September is 26.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.7 °F by the end of September.
The climate of Chicago in September is notably wet, with an average of 13 rainy days, and a total of 71.9 mm of precipitation.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
17
Dry days
13
Rainy days
0
Snow days
24°/17°
Temperatures
19 km/h
Avg max wind
64 %
Avg humidity
Chicago in September average weather
Move between months or click on a day
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  26° | 2  27° | 3  27° | 4 26° | 5 28° | 6  26° | 7 23° |
| 8 24° | 9 25° | 10 26° | 11 25° | 12 23° | 13  25° | 14 25° |
| 15  27° | 16 27° | 17 25° | 18 24° | 19 24° | 20 28° | 21 25° |
| 22 21° | 23 19° | 24 23° | 25 22° | 26 23° | 27 21° | 28 19° |
| 29 22° | 30 22° |
You can click on date
Access Chicago weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during September in Chicago
See the weather trend as well as the moving average line
September weather day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Sunny | 26° /18° | 0 mm | 7 | |
| Sept. 2 | Partly cloudy | 27° /19° | 0 mm | 7 | |
| Sept. 3 | Moderate rain at times | 27° /18° | 1 mm | 6 | |
| Sept. 4 | Moderate rain at times | 26° /19° | 0.6 mm | 6 | |
| Sept. 5 | Sunny | 28° /19° | 0.3 mm | 7 | |
| Sept. 6 | Patchy rain possible | 26° /19° | 2.8 mm | 6 | |
| Sept. 7 | Patchy rain possible | 23° /16° | 3.8 mm | 5 | |
| Sept. 8 | Sunny | 24° /16° | 0 mm | 6 | |
| Sept. 9 | Sunny | 25° /17° | 0 mm | 6 | |
| Sept. 10 | Sunny | 26° /17° | 0 mm | 7 | |
| Sept. 11 | Moderate or heavy rain shower | 25° /17° | 25.4 mm | 6 | |
| Sept. 12 | Partly cloudy | 23° /17° | 0.2 mm | 6 | |
| Sept. 13 | Overcast | 25° /17° | 0.3 mm | 6 | |
| Sept. 14 | Sunny | 25° /18° | 0.7 mm | 6 | |
| Sept. 15 | Cloudy | 27° /18° | 0 mm | 6 | |
| Sept. 16 | Sunny | 27° /18° | 0.6 mm | 6 | |
| Sept. 17 | Partly cloudy | 25° /18° | 0.6 mm | 6 | |
| Sept. 18 | Cloudy | 24° /18° | 0.9 mm | 6 | |
| Sept. 19 | Patchy rain possible | 24° /17° | 5.4 mm | 5 | |
| Sept. 20 | Overcast | 28° /18° | 1.6 mm | 6 | |
| Sept. 21 | Moderate or heavy rain shower | 25° /18° | 3.3 mm | 6 | |
| Sept. 22 | Patchy rain possible | 21° /16° | 9.1 mm | 5 | |
| Sept. 23 | Patchy rain possible | 19° /14° | 0.4 mm | 5 | |
| Sept. 24 | Overcast | 23° /14° | 2.6 mm | 5 | |
| Sept. 25 | Cloudy | 22° /15° | 0.8 mm | 5 | |
| Sept. 26 | Partly cloudy | 23° /14° | 6.4 mm | 6 | |
| Sept. 27 | Sunny | 21° /15° | 2.4 mm | 5 | |
| Sept. 28 | Patchy rain possible | 19° /15° | 0.2 mm | 5 | |
| Sept. 29 | Sunny | 22° /15° | 2.6 mm | 6 | |
| Sept. 30 | Sunny | 22° /16° | 0 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Chicago 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 Chicago forecast closer to your planned date for the most up-to-date weather information.
Chicago in September - FAQ
What are the expected maximum and minimum temperatures in Chicago during September?
During September, expect a variety of temperatures with highs around 24° and lows near 17°, suitable for diverse activities and preferences.
How much rainfall should be expected in Chicago during September?
Moderate rainfall is anticipated in Chicago during September, with a total of 71.9 mm spread over approximately 13 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Chicago during September?
The average wind speed in Chicago during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Chicago
Explore the daily rainfall trends and prepare for Chicagos September weather 💧
UV exposure in Chicago during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Quick links
You are here
Where is Chicago?Get accurate weather forecasts for Chicago, located at latitude 41.85 and longitude -87.65. Stay updated with localized weather information tailored for Chicago.
Related locations
Select a location for accurate weather forecast
More Locations Found a mistake?
We appreciate your attention to details. Tell us here.