Weather Alert
Williamson County Regional Weather Warning NWS WEATHER ALERT FOR THE WILLIAMSON COUNTY REGIONAL, IL AREA - Issued: 204 PM CDT Thu Aug 13 2026 Williamson County Regional Weather Warning

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Williamson County Regional, IL Weather - Hour by Hour Forecast

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Williamson County Regional, IL Weather - Hour by Hour Forecast

24 Hour Forecast

Current Conditions - Clear. Temperature is 81°F27°C, dew point 76°F24°C, humidity 87%. Wind direction is SSW at 5 mph8 km/h with visibility of 10.00 mi16 km. Barometric pressure is 29.97 in1015 mb.
Tonight - Mostly clear. Lows in the mid 70s. South winds around 5 mph... Full Forecast
Friday - Mostly sunny. Hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Highest heat index readings heat index readings up to .. Full Forecast

Williamson County Regional Hourly Weather

24 Hour Forecast Scroll
Thu, Aug 13
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Williamson County Regional, IL Hourly Weather - Clear - 11:00 PM Williamson County Regional, IL Hourly Weather - Clear - 12:00 AM Williamson County Regional, IL Hourly Weather - Clear - 1:00 AM Williamson County Regional, IL Hourly Weather - Clear - 2:00 AM Williamson County Regional, IL Hourly Weather - Partly Cloudy - 3:00 AM Williamson County Regional, IL Hourly Weather - Partly Cloudy - 4:00 AM Williamson County Regional, IL Hourly Weather - Partly Cloudy - 5:00 AM Williamson County Regional, IL Hourly Weather - Mostly Cloudy - 6:00 AM Williamson County Regional, IL Hourly Weather - Mostly Cloudy - 7:00 AM Williamson County Regional, IL Hourly Weather - Mostly Cloudy - 8:00 AM Williamson County Regional, IL Hourly Weather - Partly Cloudy - 9:00 AM Williamson County Regional, IL Hourly Weather - Partly Cloudy - 10:00 AM Williamson County Regional, IL Hourly Weather - Partly Cloudy - 11:00 AM Williamson County Regional, IL Hourly Weather - Clear - 12:00 PM Williamson County Regional, IL Hourly Weather - Clear - 1:00 PM Williamson County Regional, IL Hourly Weather - Clear - 2:00 PM Williamson County Regional, IL Hourly Weather - Clear - 3:00 PM Williamson County Regional, IL Hourly Weather - Clear - 4:00 PM Williamson County Regional, IL Hourly Weather - Clear - 5:00 PM Williamson County Regional, IL Hourly Weather - Clear - 6:00 PM Williamson County Regional, IL Hourly Weather - Clear - 7:00 PM Williamson County Regional, IL Hourly Weather - Clear - 8:00 PM Williamson County Regional, IL Hourly Weather - Mostly Clear - 9:00 PM Williamson County Regional, IL Hourly Weather - Mostly Clear - 10:00 PM
Clear Clear Clear Clear Partly Cloudy Partly Cloudy Partly Cloudy Mostly Cloudy Mostly Cloudy Mostly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Clear Clear Clear Clear Clear Clear Clear Clear Clear Mostly Clear Mostly Clear
80°F27°C 78°F26°C 77°F25°C 76°F24°C 75°F24°C 74°F23°C 74°F23°C 74°F23°C 74°F23°C 78°F26°C 82°F28°C 86°F30°C 88°F31°C 91°F33°C 93°F34°C 95°F35°C 96°F36°C 98°F37°C 96°F36°C 93°F34°C 91°F33°C 87°F31°C 83°F28°C 79°F26°C
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4% 4% 4% 4% 4% 4% 4% 4% 4% 4% 4% 4% 4% 4% 4% 2% 2% 2% 2% 2% 2% 2% 2% 2%
72°F22°C 71°F22°C 71°F22°C 70°F21°C 70°F21°C 69°F21°C 69°F21°C 69°F21°C 69°F21°C 70°F21°C 70°F21°C 71°F22°C 71°F22°C 70°F21°C 70°F21°C 69°F21°C 68°F20°C 67°F19°C 68°F20°C 68°F20°C 69°F21°C 69°F21°C 69°F21°C 69°F21°C
77% 79% 82% 82% 84% 84% 84% 84% 84% 77% 67% 61% 57% 50% 47% 43% 40% 37% 40% 44% 49% 55% 63% 72%
S S S S S S S SSE SSE SW SW SW SW SW SW SW SW SW SSE S S S S S
4 mph 4 mph 4 mph 4 mph 4 mph 4 mph 4 mph 6 mph 6 mph 6 mph 6 mph 6 mph 6 mph 9 mph 9 mph 9 mph 9 mph 9 mph 9 mph 6 mph 6 mph 6 mph 4 mph 4 mph
10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km
Hour (CDT)
Weather
Clouds
Temperature
Precip. Type
POP
Dewpoint
Humidity
Wind Direction
Wind Speed
Visibility
POP = Probability of Precipitation. ** Indicates missing data/values from KMWA model statistics.

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Williamson County Regional Radar Loop

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Prob Precip % = Probability of Precipitation.

Williamson County Regional 36 Hour Forecast

POP = Probability of Precipitation. ** Indicates missing data/values from model statistics.

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