Weather in Williamson County, Illinois for March 2026
Until now, March 2026 in Williamson County has been nearly identical to the historical average, with a temperature of 15.8 °F (showing only a slight deviation of 0.3 °F).
The forecast for the upcoming days in Williamson County predicts a temperature of 20 °F, which is slightly above the historical average.
In general, the average temperature in Williamson County at the beginning of March is 14.7 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 17.9 °F by the end of March.
The climate of Williamson County in March is notably wet, with an average of 14 rainy days, and a total of 124.1 mm of precipitation.
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Williamson County Weather March
Temperatures trend during March in Williamson County
March weather in Williamson County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Mar. 1 |  Overcast | 11° /2° | 0.7 mm | 2 | |
| Mar. 2 |  Sunny | 10° /1° | 11 mm | 2 | |
| Mar. 3 | Sunny | 15° /4° | 1.3 mm | 3 | |
| Mar. 4 |  Thundery outbreaks possible | 20° /12° | 18 mm | 3 | |
| Mar. 5 |  Light rain shower | 17° /11° | 25.9 mm | 3 | |
| Mar. 6 |  Partly cloudy | 16° /6° | 0 mm | 3 | |
| Mar. 7 |  Mist | 14° /6° | 1 mm | 4 | |
| Mar. 8 |  Moderate or heavy rain with thunder | 13° /8° | 8.7 mm | 4 | |
| Mar. 9 |  Moderate rain | 14° /5° | 5.4 mm | 3 | |
| Mar. 10 | Sunny | 18° /6° | 0 mm | 3 | |
| Mar. 11 | Sunny | 19° /5° | 2.4 mm | 4 | |
| Mar. 12 | Overcast | 17° /5° | 0 mm | 4 | |
| Mar. 13 | Light rain shower | 18° /9° | 0.6 mm | 4 | |
| Mar. 14 | Thundery outbreaks possible | 21° /10° | 0.5 mm | 5 | |
| Mar. 15 | Patchy rain possible | 18° /10° | 13.4 mm | 3 | |
| Mar. 16 | Overcast | 10° /2° | 4.1 mm | 4 | |
| Mar. 17 | Overcast | 11° /-1° | 0 mm | 4 | |
| Mar. 18 | Partly cloudy | 14° /2° | 0 mm | 4 | |
| Mar. 19 | Overcast | 18° /4° | 0 mm | 5 | |
| Mar. 20 | Overcast | 17° /6° | 0 mm | 4 | |
| Mar. 21 | Sunny | 31° /13° | 0 mm | 1.5 | |
| Mar. 22 | Patchy rain possible | 22° /11° | 4.1 mm | 1.5 | |
| Mar. 23 | Patchy rain possible | 11° /2° | 1.4 mm | 1.3 | |
| Mar. 24 | Partly cloudy | 17° /4° | 0 mm | 1.1 | |
| Mar. 25 | Patchy rain possible | 20° /7° | 0.3 mm | 0 | |
| Mar. 26 | Patchy rain possible | 28° /17° | 0.5 mm | 5 | |
| Mar. 27 | Patchy rain possible | 7° /3° | 3 mm | 2 | |
| Mar. 28 | Sunny | 14° /2° | 0 mm | 3 | |
| Mar. 29 | Sunny | 15° /2° | 0 mm | 3 | |
| Mar. 30 | Partly cloudy | 19° /7° | 0 mm | 4 | |
| Mar. 31 | Patchy rain possible | 22° /13° | 0.3 mm | 4 | |
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Williamson County in March - FAQ
What are the expected maximum and minimum temperatures in Williamson County during March?
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March rainfall patterns in Williamson County
UV exposure in Williamson County during March
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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.