McLean County (Bloomington)
September
Weather in McLean County, Illinois for September 2026
Your guide to McLean County weather in September - trends and predictions
The forecast for the next days in McLean County predicts temperatures to be around 30 °F, close to the historical average.
In general, the average temperature in McLean County at the beginning of September is 29.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 26.6 °F by the end of September.
With an average of 4 rainy days, McLean County experiences minimal rainfall in September.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
26
Dry days
4
Rainy days
0
Snow days
26°/14°
Temperatures
16 km/h
Avg max wind
70 %
Avg humidity
McLean County Weather September
Move between months or click on a day
Temperatures trend during September in McLean County
See the weather trend as well as the moving average line
September weather in McLean County day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Partly cloudy | 31° /16° | 0 mm | 8 | |
| Sept. 2 |  Fog | 32° /17° | 0 mm | 8 | |
| Sept. 3 |  Moderate or heavy rain shower | 30° /18° | 12.5 mm | 8 | |
| Sept. 4 |  Cloudy | 29° /16° | 0 mm | 8 | |
| Sept. 5 |  Sunny | 36° /22° | 0 mm | 7.4 | |
| Sept. 6 | Sunny | 25° /19° | 0 mm | 7.5 | |
| Sept. 7 | Sunny | 25° /16° | 0 mm | 7.7 | |
| Sept. 8 | Sunny | 30° /17° | 0 mm | 7.6 | |
| Sept. 9 | Sunny | 31° /23° | 0.2 mm | 8 | |
| Sept. 10 |  Overcast | 25° /18° | 0 mm | 7 | |
| Sept. 11 |  Patchy rain possible | 24° /15° | 3.6 mm | 6 | |
| Sept. 12 | Sunny | 26° /16° | 0.3 mm | 7 | |
| Sept. 13 | Sunny | 27° /16° | 0 mm | 7 | |
| Sept. 14 | Sunny | 36° /21° | 0 mm | 9 | |
| Sept. 15 | Light rain shower | 36° /25° | 1.4 mm | 9 | |
| Sept. 16 | Overcast | 35° /24° | 3.3 mm | 8 | |
| Sept. 17 | Overcast | 31° /23° | 0.3 mm | 7 | |
| Sept. 18 | Partly cloudy | 26° /19° | 0 mm | 7 | |
| Sept. 19 |  Thundery outbreaks possible | 28° /16° | 0 mm | 5 | |
| Sept. 20 | Thundery outbreaks possible | 27° /17° | 14.8 mm | 4 | |
| Sept. 21 | Mist | 23° /19° | 0 mm | 2 | |
| Sept. 22 | Moderate or heavy rain shower | 25° /15° | 5.6 mm | 3 | |
| Sept. 23 | Fog | 27° /20° | 0 mm | 1 | |
| Sept. 24 | Light rain shower | 21° /18° | 15.4 mm | 1 | |
| Sept. 25 | Fog | 22° /12° | 0 mm | 2 | |
| Sept. 26 | Fog | 26° /11° | 0 mm | 5 | |
| Sept. 27 | Sunny | 29° /14° | 0 mm | 5 | |
| Sept. 28 | Sunny | 30° /15° | 0 mm | 5 | |
| Sept. 29 | Sunny | 30° /15° | 0 mm | 5 | |
| Sept. 30 | Overcast | 28° /15° | 0 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for McLean 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 McLean County forecast closer to your planned date for the most up-to-date weather information.
Change Month
McLean County in September - FAQ
What are the expected maximum and minimum temperatures in McLean County 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 McLean County during September?
Moderate rainfall is anticipated in McLean County during September, with a total of 60.8 mm spread over approximately 4 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in McLean County during September?
The average wind speed in McLean County during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in McLean County
Explore the daily rainfall trends and prepare for McLean Countys September weather 💧
Typically, McLean County has 4 rainy days in September with a total of 60.8 mm of rainfall.
UV exposure in McLean County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in McLean County
Select a location for an accurate weather forecast
More Locations Quick links
More McLean County weather pages
You are here
Where is McLean County?Get accurate weather forecasts for McLean County, located at latitude 40.484 and longitude -88.994. Stay updated with localized weather information tailored for McLean County.
Found a mistake?
We appreciate your attention to details. Tell us here.