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.

Mostly Cloudy

84°F

29°C

Humidity 74%
Wind Speed N 8 mph
Barometer 30.08 in
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index92°F (33°C)
Last update 14 Aug 9:45 am CDT
Extended Forecast for

Vienna IL

Extreme Heat Warning August 14, 10:00am until August 16, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 14, 10:00am until August 16, 08:00pm

    NOW until 8:00pm Sun

    Extreme Heat Warning

  • Today

    High: 97 °F

    Hot

  • Tonight

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

    Low: 75 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 98. Heat index values as high as 110. Calm wind becoming southwest around 6 mph in the morning.

    High: 98 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 75. Light south southwest wind.

    Low: 75 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 99. Calm wind becoming west southwest around 6 mph in the morning.

    High: 99 °F

    Hot

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 75. Light and variable wind.

    Low: 75 °F

    Partly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. North wind 3 to 6 mph.

    High: 91 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 68. North wind around 5 mph becoming calm in the evening.

    Low: 68 °F

    Partly Cloudy

Detailed Forecast

Today
Sunny and hot, with a high near 97. Heat index values as high as 111. South southwest wind around 6 mph.
Tonight
Mostly clear, with a low around 75. Calm wind.
Saturday
Sunny and hot, with a high near 98. Heat index values as high as 110. Calm wind becoming southwest around 6 mph in the morning.
Saturday Night
Mostly clear, with a low around 75. Light south southwest wind.
Sunday
Sunny and hot, with a high near 99. Calm wind becoming west southwest around 6 mph in the morning.
Sunday Night
Partly cloudy, with a low around 75. Light and variable wind.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. North wind 3 to 6 mph.
Monday Night
Partly cloudy, with a low around 68. North wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 90. Calm wind.
Tuesday Night
Mostly clear, with a low around 69. Calm wind.
Wednesday
Sunny, with a high near 94. Calm wind becoming southwest 5 to 7 mph in the morning.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 72. Light and variable wind.
Thursday
Mostly sunny, with a high near 91. Light and variable wind becoming north northwest 5 to 7 mph in the morning.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Vienna IL
 37.42°N 88.88°W
Last Update:
7:01 am CDT Aug 14, 2026
Forecast Valid:
10am CDT Aug 14, 2026-6pm CDT Aug 20, 2026
 
Forecast Discussion
 
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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