McLean County (Bloomington)
September
Weather in McLean County, Illinois for September 2026
Your guide to McLean County weather in September - trends and predictions
In general, the average temperature in McLean County at the beginning of September is 22.3 °F. As the month progressed, temperatures tended to significantly warm up, 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.
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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
71 %
Avg humidity
McLean County Weather September
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Temperatures trend during September in McLean County
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September weather in McLean County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Partly cloudy | 26° /10° | 0 mm | 8 | |
| Sept. 2 |  Fog | 27° /11° | 0 mm | 8 | |
| Sept. 3 |  Moderate or heavy rain shower | 24° /13° | 25 mm | 8 | |
| Sept. 4 |  Cloudy | 21° /9° | 0 mm | 8 | |
| Sept. 5 |  Overcast | 18° /11° | 0 mm | 6 | |
| Sept. 6 | Mist | 19° /7° | 0 mm | 6 | |
| Sept. 7 |  Sunny | 21° /6° | 0 mm | 8 | |
| Sept. 8 | Sunny | 23° /7° | 0 mm | 7 | |
| Sept. 9 | Overcast | 22° /8° | 0 mm | 5 | |
| Sept. 10 | Cloudy | 26° /11° | 0 mm | 7 | |
| Sept. 11 | Cloudy | 28° /16° | 0 mm | 7 | |
| Sept. 12 | Overcast | 29° /14° | 0 mm | 7 | |
| Sept. 13 | Cloudy | 33° /19° | 0 mm | 7 | |
| Sept. 14 |  Thundery outbreaks possible | 35° /20° | 0 mm | 7 | |
| Sept. 15 | Fog | 30° /21° | 0 mm | 3 | |
| Sept. 16 | Cloudy | 31° /17° | 0 mm | 6 | |
| Sept. 17 | Sunny | 30° /13° | 0 mm | 6 | |
| Sept. 18 | Cloudy | 29° /15° | 0 mm | 5 | |
| 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 | |
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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 ☀️
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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.
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