Williamson County (Energy)
October
Weather in Williamson County, Illinois for October 2025
Your guide to Williamson County weather in October - trends and predictions
Until now, October 2025 in Williamson County is slightly cooler than the historical average by -0.9 °F.
In general, the average temperature in Williamson County at the beginning of October is 26.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.9 °F by the end of October.
Precipitation in Williamson County during October is a rare event, with an average of fewer than 2 rainy days.
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Temperatures
Rain 🌧️
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30
Dry days
1
Rainy days
0
Snow days
23°/10°
Temperatures
18 km/h
Avg max wind
62 %
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 |  Overcast | 27° /14° | 0 mm | 6 | |
| Oct. 2 |  Sunny | 26° /12° | 0 mm | 6 | |
| Oct. 3 | Sunny | 27° /15° | 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 | Sunny | 16° /5° | 0 mm | 0.7 | |
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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 23° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Williamson County during October?
In October, Williamson County can expect light to moderate rainfall, totaling 39.7 mm across approximately 1 days. Occasional showers are possible, and planning ahead for them could be helpful.
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 💧
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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