Williamson County (Energy)
May
Weather in Williamson County, Illinois for May 2027
Your guide to Williamson County weather in May - trends and predictions
In general, the average temperature in Williamson County at the beginning of May is 20.1 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 24 °C by the end of May.
The climate of Williamson County in May is notably wet, with an average of 15 rainy days, and a total of 277.3 mm of precipitation.
Is May a good time to visit Williamson County? check out the best time to travel to Williamson County page.
✨ Is May a good time to visit Williamson County? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
16
Dry days
15
Rainy days
0
Snow days
23°/14°
Temperatures
20 km/h
Avg max wind
79 %
Avg humidity
Williamson County Weather May
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Temperatures trend during May in Williamson County
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May weather in Williamson County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Thundery outbreaks possible | 23° /13° | 6.5 mm | 7 | |
| May 2 |  Light rain | 20° /12° | 3.1 mm | 7 | |
| May 3 |  Heavy rain | 19° /11° | 30.8 mm | 6 | |
| May 4 |  Overcast | 21° /13° | 0.8 mm | 6 | |
| May 5 |  Moderate rain | 18° /12° | 18.6 mm | 4 | |
| May 6 | Light rain | 19° /12° | 6.5 mm | 4 | |
| May 7 |  Patchy rain possible | 21° /13° | 1.3 mm | 7 | |
| May 8 |  Patchy light rain with thunder | 23° /12° | 6.6 mm | 7 | |
| May 9 | Patchy rain possible | 22° /11° | 1.3 mm | 7 | |
| May 10 | Overcast | 20° /11° | 0 mm | 5 | |
| May 11 |  Partly cloudy | 21° /11° | 0 mm | 7 | |
| May 12 | Moderate rain | 23° /13° | 21.9 mm | 7 | |
| May 13 | Light rain | 21° /15° | 4.3 mm | 6 | |
| May 14 | Patchy light rain with thunder | 23° /13° | 14.3 mm | 7 | |
| May 15 | Patchy rain possible | 25° /16° | 1.5 mm | 8 | |
| May 16 | Light rain | 25° /18° | 7.5 mm | 6 | |
| May 17 | Light rain | 24° /18° | 4.1 mm | 8 | |
| May 18 | Light rain | 24° /17° | 8.1 mm | 6 | |
| May 19 |  Moderate or heavy rain shower | 28° /18° | 6.5 mm | 6 | |
| May 20 | Thundery outbreaks possible | 24° /17° | 36.9 mm | 5 | |
| May 21 | Light rain | 27° /16° | 5.8 mm | 7 | |
| May 22 |  Moderate or heavy rain with thunder | 21° /16° | 6.9 mm | 4 | |
| May 23 | Light rain shower | 22° /14° | 1.1 mm | 4 | |
| May 24 | Moderate or heavy rain with thunder | 22° /16° | 30.3 mm | 5 | |
| May 25 | Thundery outbreaks possible | 24° /16° | 1.2 mm | 6 | |
| May 26 | Heavy rain | 23° /16° | 30.4 mm | 6 | |
| May 27 | Moderate rain | 23° /16° | 15.9 mm | 6 | |
| May 28 |  Sunny | 24° /17° | 0.9 mm | 6 | |
| May 29 | Partly cloudy | 23° /15° | 0.1 mm | 7 | |
| May 30 | Patchy rain possible | 25° /14° | 2.3 mm | 7 | |
| May 31 | Patchy light drizzle | 26° /16° | 1.7 mm | 8 | |
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Important Notice
Our weather forecast for Williamson County in May 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 May - FAQ
What are the expected maximum and minimum temperatures in Williamson County during May?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Williamson County during May?
Significant rainfall exceeding 277.3 mm is expected in Williamson County during May, occurring over more than 15 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Williamson County during May?
The average wind speed in Williamson County during May is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Williamson County
Explore the daily rainfall trends and prepare for Williamson Countys May weather 💧
Typically, Williamson County has 15 rainy days in May with a total of 277.3 mm of rainfall.
UV exposure in Williamson County during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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