National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Partly Cloudy

73°F

23°C

Humidity 98%
Wind Speed Calm
Barometer 29.87 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Last update 13 Aug 1:35 am CDT
Extended Forecast for

3 Miles NNE Vienna IL

Heat Advisory August 13, 01:45am until August 13, 11:00am
Extreme Heat Warning August 13, 11:00am until August 16, 08:00pm
Click here for hazard details and duration
Heat Advisory
Extreme Heat Warning
  •  
    Heat Advisory August 13, 01:45am until August 13, 11:00am

    NOW until 11:00am Thu

    Heat Advisory

  • Overnight

    Low: 75 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 95. Heat index values as high as 110. South southwest wind 3 to 7 mph.

    High: 95 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 76. Light south wind.

    Low: 76 °F

    Mostly Clear

  • Friday

    Friday: Sunny and hot, with a high near 97. Heat index values as high as 111. Southwest wind 3 to 7 mph.

    High: 97 °F

    Hot

  • Friday Night

    Friday Night: Mostly clear, with a low around 75. Calm wind.

    Low: 75 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 98. Calm wind becoming southwest around 6 mph in the morning.

    High: 98 °F

    Hot

  • Saturday Night

    Saturday Night: Clear, with a low around 76. Light south wind.

    Low: 76 °F

    Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 99. West southwest wind 3 to 6 mph.

    High: 99 °F

    Hot

Detailed Forecast

Overnight
Mostly cloudy, with a low around 75. South southwest wind 3 to 5 mph.
Thursday
Mostly sunny, with a high near 95. Heat index values as high as 110. South southwest wind 3 to 7 mph.
Thursday Night
Mostly clear, with a low around 76. Light south wind.
Friday
Sunny and hot, with a high near 97. Heat index values as high as 111. Southwest wind 3 to 7 mph.
Friday Night
Mostly clear, with a low around 75. Calm wind.
Saturday
Sunny and hot, with a high near 98. Calm wind becoming southwest around 6 mph in the morning.
Saturday Night
Clear, with a low around 76. Light south wind.
Sunday
Sunny and hot, with a high near 99. West southwest wind 3 to 6 mph.
Sunday Night
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 75. Light and variable wind.
Monday
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. Calm wind becoming north around 6 mph in the morning.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 70. Light north northeast wind.
Tuesday
Mostly sunny, with a high near 90. Light northeast wind.
Tuesday Night
Mostly clear, with a low around 70. Calm wind.
Wednesday
Sunny, with a high near 93. Calm wind becoming south southwest around 6 mph in the morning.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNE Vienna IL
 37.44°N 88.88°W
Last Update:
1:26 am CDT Aug 13, 2026
Forecast Valid:
1am CDT Aug 13, 2026-6pm CDT Aug 19, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation