Effingham (IL)
September
Weather in Effingham, Illinois for September 2026
Your guide to Effingham weather in September - trends and predictions
So far, September 2026 in Effingham shows a warmer trend than usual by 3.4 °F.
The forecast for the next days in Effingham predicts temperatures to be around 22 °F, close to the historical average.
In general, the average temperature in Effingham at the beginning of September is 29.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.3 °F by the end of September.
The climate of Effingham in September is notably wet, with an average of 11 rainy days, and a total of 241.6 mm of precipitation.
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Temperatures
Rain 🌧️
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19
Dry days
11
Rainy days
0
Snow days
27°/15°
Temperatures
16 km/h
Avg max wind
67 %
Avg humidity
Effingham Weather September
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Temperatures trend during September in Effingham
See the weather trend as well as the moving average line
September weather in Effingham day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Patchy rain possible | 31° /16° | 0.2 mm | 7 | |
| Sept. 2 |  Sunny | 31° /15° | 0 mm | 8 | |
| Sept. 3 |  Overcast | 30° /16° | 0 mm | 7 | |
| Sept. 4 |  Partly cloudy | 31° /17° | 9.3 mm | 7 | |
| Sept. 5 | Patchy rain possible | 31° /17° | 0 mm | 7 | |
| Sept. 6 |  Cloudy | 28° /15° | 7.8 mm | 6 | |
| Sept. 7 | Sunny | 26° /11° | 0 mm | 7 | |
| Sept. 8 | Sunny | 27° /9° | 0 mm | 6 | |
| Sept. 9 | Sunny | 28° /13° | 4.4 mm | 7 | |
| Sept. 10 | Sunny | 27° /15° | 4.8 mm | 5 | |
| Sept. 11 | Sunny | 30° /16° | 0 mm | 5 | |
| Sept. 12 | Sunny | 31° /17° | 0.2 mm | 7 | |
| Sept. 13 | Overcast | 29° /18° | 1.1 mm | 6 | |
| Sept. 14 | Cloudy | 31° /17° | 0.5 mm | 7 | |
| Sept. 15 | Cloudy | 33° /19° | 0.3 mm | 7 | |
| Sept. 16 | Sunny | 32° /18° | 1 mm | 6 | |
| Sept. 17 | Cloudy | 31° /17° | 0.2 mm | 7 | |
| Sept. 18 | Sunny | 30° /18° | 0.7 mm | 6 | |
| Sept. 19 | Cloudy | 32° /17° | 1.6 mm | 6 | |
| Sept. 20 | Overcast | 34° /19° | 2.4 mm | 7.2 | |
| Sept. 21 | Light rain shower | 23° /17° | 5.4 mm | 2.4 | |
| Sept. 22 | Overcast | 21° /13° | 0 mm | 4 | |
| Sept. 23 | Overcast | 23° /13° | 0 mm | 6.2 | |
| Sept. 24 | Sunny | 23° /12° | 0 mm | 6 | |
| Sept. 25 | Patchy rain possible | 19° /15° | 6.7 mm | 4 | |
| Sept. 26 | Sunny | 24° /14° | 0 mm | 6 | |
| Sept. 27 | Sunny | 25° /14° | 0 mm | 7 | |
| Sept. 28 | Overcast | 17° /11° | 4.5 mm | 4 | |
| Sept. 29 | Sunny | 17° /6° | 0 mm | 5 | |
| Sept. 30 | Sunny | 24° /9° | 0 mm | 6 | |
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Important Notice
Our weather forecast for Effingham 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 Effingham forecast closer to your planned date for the most up-to-date weather information.
Change Month
Effingham in September - FAQ
What are the expected maximum and minimum temperatures in Effingham during September?
During September, expect a variety of temperatures with highs around 27° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Effingham during September?
Significant rainfall exceeding 241.6 mm is expected in Effingham during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Effingham during September?
The average wind speed in Effingham during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Effingham
Explore the daily rainfall trends and prepare for Effinghams September weather 💧
Typically, Effingham has 11 rainy days in September with a total of 241.6 mm of rainfall.
UV exposure in Effingham during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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