Weather in Williamson County, Illinois for July 2026
Heat Advisory - See hour by hour.
Until now, July 2026 in Williamson County has been nearly identical to the historical average, with a temperature of 31.7 °C (showing only a slight deviation of 0.4 °C).
The forecast for the next days in Williamson County predicts temperatures to be around 31 °C, close to the historical average.
In general, the average temperature in Williamson County at the beginning of July is 31.4 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 32.3 °C by the end of July.
Williamson County experiences heavy rainfall in July, with over 20 rainy days and an average total precipitation 205.7 mm.
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Williamson County Weather July
Temperatures trend during July in Williamson County
July weather in Williamson County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Jul. 1 |  Sunny | 30° /18° | 6.9 mm | 9 | |
| Jul. 2 | Sunny | 32° /19° | 0.4 mm | 9 | |
| Jul. 3 |  Patchy light rain with thunder | 34° /21° | 23.5 mm | 9 | |
| Jul. 4 |  Moderate or heavy rain with thunder | 32° /21° | 6.7 mm | 9 | |
| Jul. 5 |  Patchy rain possible | 31° /21° | 3.8 mm | 8 | |
| Jul. 6 |  Partly cloudy | 30° /20° | 5.2 mm | 9 | |
| Jul. 7 | Sunny | 31° /21° | 3.1 mm | 9 | |
| Jul. 8 | Partly cloudy | 32° /21° | 2.7 mm | 9 | |
| Jul. 9 |  Moderate or heavy rain shower | 27° /20° | 24.4 mm | 7 | |
| Jul. 10 |  Fog | 30° /19° | 51.7 mm | 7 | |
| Jul. 11 | Partly cloudy | 31° /20° | 10.1 mm | 8 | |
| Jul. 12 | Patchy light rain with thunder | 32° /20° | 11.5 mm | 9 | |
| Jul. 13 | Patchy rain possible | 32° /20° | 5.1 mm | 9 | |
| Jul. 14 | Sunny | 32° /21° | 4.3 mm | 9 | |
| Jul. 15 | Sunny | 33° /22° | 2.6 mm | 9 | |
| Jul. 16 |  Thundery outbreaks possible | 33° /23° | 21.6 mm | 9 | |
| Jul. 17 | Light rain shower | 31° /23° | 4.6 mm | 9 | |
| Jul. 18 | Patchy rain possible | 30° /21° | 0.3 mm | 8 | |
| Jul. 19 | Mist | 31° /20° | 1.2 mm | 8 | |
| Jul. 20 | Sunny | 34° /22° | 0 mm | 9.2 | |
| Jul. 21 | Sunny | 38° /23° | 0 mm | 10.6 | |
| Jul. 22 | Sunny | 28° /18° | 0 mm | 9.5 | |
| Jul. 23 | Sunny | 27° /17° | 0 mm | 9.1 | |
| Jul. 24 | Partly cloudy | 24° /17° | 8.8 mm | 5 | |
| Jul. 25 |  Cloudy | 26° /18° | 1.2 mm | 7 | |
| Jul. 26 | Sunny | 34° /20° | 0 mm | 8 | |
| Jul. 27 | Sunny | 32° /20° | 0 mm | 8 | |
| Jul. 28 | Sunny | 36° /25° | 0 mm | 9 | |
| Jul. 29 | Sunny | 39° /26° | 0 mm | 9 | |
| Jul. 30 | Sunny | 32° /23° | 18.2 mm | 7 | |
| Jul. 31 | Sunny | 27° /17° | 0 mm | 7 | |
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Williamson County in July - FAQ
What are the expected maximum and minimum temperatures in Williamson County during July?
How much rainfall should be expected in Williamson County during July?
What are the typical wind conditions in Williamson County during July?
July rainfall patterns in Williamson County
UV exposure in Williamson County during July
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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.