Williamson County (Energy)
October
Weather in Williamson County, Illinois for October 2026
Your guide to Williamson County weather in October - trends and predictions
The forecast for the first days of October 2026 in Williamson County predicts the temperature to be 25.6 °F, significantly warmer than the historical average.
In general, the average temperature in Williamson County at the beginning of October is 23.4 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.3 °F by the end of October.
Williamson County experiences moderate rainfall in October, with an average of 6 rainy days and a total precipitation of 174.8 mm.
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Temperatures
Rain 🌧️
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25
Dry days
6
Rainy days
0
Snow days
22°/11°
Temperatures
18 km/h
Avg max wind
65 %
Avg humidity
Williamson County Weather October
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Temperatures trend during October in Williamson County
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October weather in Williamson County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Oct. 1 |  Sunny | 18° /10° | 1.7 mm | 5 | |
| Oct. 2 | Sunny | 19° /7° | 0 mm | 5 | |
| Oct. 3 |  Overcast | 23° /9° | 0 mm | 6 | |
| Oct. 4 |  Fog | 28° /15° | 0 mm | 7 | |
| Oct. 5 | Sunny | 29° /16° | 0 mm | 8 | |
| Oct. 6 | Sunny | 24° /17° | 0 mm | 6 | |
| Oct. 7 | Sunny | 23° /12° | 0.8 mm | 6 | |
| Oct. 8 | Sunny | 22° /8° | 0 mm | 6 | |
| Oct. 9 | Sunny | 23° /8° | 0 mm | 6 | |
| Oct. 10 | Sunny | 24° /7° | 0 mm | 6 | |
| Oct. 11 | Sunny | 25° /14° | 0 mm | 6 | |
| Oct. 12 | Overcast | 26° /13° | 0 mm | 6 | |
| Oct. 13 |  Thundery outbreaks possible | 25° /14° | 0 mm | 7 | |
| Oct. 14 |  Partly cloudy | 20° /9° | 0 mm | 5 | |
| Oct. 15 |  Cloudy | 20° /9° | 0 mm | 5 | |
| Oct. 16 | Sunny | 21° /8° | 0 mm | 6 | |
| Oct. 17 | Sunny | 20° /8° | 0 mm | 5 | |
| Oct. 18 | Sunny | 24° /11° | 0 mm | 6 | |
| Oct. 19 | Mist | 20° /9° | 72.1 mm | 5 | |
| Oct. 20 | Sunny | 22° /8° | 0 mm | 6 | |
| Oct. 21 | Sunny | 22° /10° | 0 mm | 6 | |
| Oct. 22 | Sunny | 23° /7° | 0 mm | 6 | |
| Oct. 23 | Sunny | 21° /10° | 0 mm | 5 | |
| Oct. 24 | Partly cloudy | 19° /6° | 0 mm | 6 | |
| Oct. 25 | Thundery outbreaks possible | 21° /11° | 0 mm | 5 | |
| Oct. 26 | Partly cloudy | 17° /10° | 14.7 mm | 5 | |
| Oct. 27 | Overcast | 15° /8° | 5.7 mm | 4 | |
| Oct. 28 | Overcast | 18° /9° | 5.1 mm | 4 | |
| Oct. 29 | Cloudy | 19° /12° | 36.5 mm | 5 | |
| Oct. 30 | Overcast | 19° /10° | 0.4 mm | 5 | |
| Oct. 31 |  Heavy rain | 19° /11° | 39.7 mm | 4 | |
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Important Notice
Our weather forecast for Williamson County in October 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 Williamson County forecast closer to your planned date for the most up-to-date weather information.
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Williamson County in October - FAQ
What are the expected maximum and minimum temperatures in Williamson County during October?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Williamson County during October?
Significant rainfall exceeding 174.8 mm is expected in Williamson County during October, occurring over more than 6 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Williamson County during October?
The average wind speed in Williamson County during October is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
October rainfall patterns in Williamson County
Explore the daily rainfall trends and prepare for Williamson Countys October weather 💧
Typically, Williamson County has 6 rainy days in October with a total of 174.8 mm of rainfall.
UV exposure in Williamson County during October
Stay informed about UV levels for safe outdoor activities throughout the month of October ☀️
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Where is Williamson County?Get accurate weather forecasts for Williamson County, located at latitude 37.774 and longitude -89.026. Stay updated with localized weather information tailored for Williamson County.
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