Macon County (Decatur)
September
Weather in Macon County, Illinois for September 2025
Your guide to Macon County weather in September - trends and predictions
Until now, September 2025 in Macon County is slightly cooler than the historical average by -0.9 °F.
The forecast for the coming days of September 2025 predicts a temperature of 31.3 °F , which is warmer than usual.
In general, the average temperature in Macon County at the beginning of September is 25.1 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 30.1 °F by the end of September.
With an average of 3 rainy days, Macon County experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
27
Dry days
3
Rainy days
0
Snow days
26°/15°
Temperatures
19 km/h
Avg max wind
61 %
Avg humidity
Macon County Weather September
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Temperatures trend during September in Macon County
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September weather in Macon County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 28° /13° | 0 mm | 7 | |
| Sept. 2 | Sunny | 26° /11° | 0 mm | 7 | |
| Sept. 3 |  Overcast | 25° /13° | 0 mm | 6 | |
| Sept. 4 | Sunny | 26° /12° | 2.6 mm | 7 | |
| Sept. 5 | Sunny | 25° /14° | 0 mm | 6 | |
| Sept. 6 |  Mist | 24° /10° | 0.2 mm | 5 | |
| Sept. 7 | Sunny | 22° /7° | 0 mm | 6 | |
| Sept. 8 |  Partly cloudy | 23° /6° | 0 mm | 6 | |
| Sept. 9 | Sunny | 26° /9° | 0 mm | 6 | |
| Sept. 10 | Sunny | 29° /12° | 0 mm | 8 | |
| Sept. 11 | Sunny | 32° /15° | 0 mm | 8 | |
| Sept. 12 | Sunny | 31° /15° | 0 mm | 8 | |
| Sept. 13 |  Light rain | 29° /17° | 0.8 mm | 7 | |
| Sept. 14 | Partly cloudy | 34° /18° | 0 mm | 8 | |
| Sept. 15 |  Patchy rain possible | 32° /19° | 0.2 mm | 7 | |
| Sept. 16 | Sunny | 32° /15° | 0 mm | 1.5 | |
| Sept. 17 | Sunny | 32° /15° | 0 mm | 1.5 | |
| Sept. 18 | Sunny | 31° /15° | 0 mm | 1.5 | |
| Sept. 19 | Patchy rain possible | 31° /21° | 0.1 mm | 0.9 | |
| Sept. 20 | Patchy rain possible | 33° /19° | 1.8 mm | 0 | |
| Sept. 21 | Patchy rain possible | 22° /18° | 2.7 mm | 4 | |
| Sept. 22 | Sunny | 32° /19° | 0 mm | 7 | |
| Sept. 23 | Patchy rain possible | 30° /20° | 2.4 mm | 5 | |
| Sept. 24 | Sunny | 29° /15° | 0 mm | 6 | |
| Sept. 25 | Sunny | 32° /17° | 0 mm | 6 | |
| Sept. 26 | Sunny | 35° /20° | 0.1 mm | 7 | |
| Sept. 27 | Patchy rain possible | 34° /21° | 0.3 mm | 6 | |
| Sept. 28 | Patchy rain possible | 34° /22° | 0.2 mm | 6 | |
| Sept. 29 | Overcast | 22° /18° | 0 mm | 5 | |
| Sept. 30 | Mist | 25° /18° | 0 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Macon 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 Macon County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Macon County in September - FAQ
What are the expected maximum and minimum temperatures in Macon County during September?
During September, expect a variety of temperatures with highs around 26° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Macon County during September?
Significant rainfall exceeding 160.4 mm is expected in Macon County during September, occurring over more than 3 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Macon County during September?
The average wind speed in Macon County during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Macon County
Explore the daily rainfall trends and prepare for Macon Countys September weather 💧
UV exposure in Macon County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Macon County?Get accurate weather forecasts for Macon County, located at latitude 39.84 and longitude -88.955. Stay updated with localized weather information tailored for Macon County.
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