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.

A Few Clouds

90°F

32°C

Humidity 59%
Wind Speed Calm
Barometer 30.11 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index99°F (37°C)
Last update 15 Aug 10:45 am CDT
Extended Forecast for

Vienna IL

  • Today

    Today: Sunny, with a high near 95. Calm wind.

    High: 95 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 71. Calm wind.

    Low: 71 °F

    Clear

  • Saturday

    Saturday: Patchy fog before 8am. Otherwise, sunny and hot, with a high near 97. Heat index values as high as 105. Calm wind.

    High: 97 °F

    Patchy Fog
    then Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 74. Calm wind.

    Low: 74 °F

    Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 98. Calm wind.

    High: 98 °F

    Hot

  • Sunday Night

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

    Low: 75 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 99. Calm wind.

    High: 99 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 76. Calm wind.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 99. Calm wind.

    High: 99 °F

    Hot

Detailed Forecast

Today
Sunny, with a high near 95. Calm wind.
Tonight
Clear, with a low around 71. Calm wind.
Saturday
Patchy fog before 8am. Otherwise, sunny and hot, with a high near 97. Heat index values as high as 105. Calm wind.
Saturday Night
Clear, with a low around 74. Calm wind.
Sunday
Sunny and hot, with a high near 98. Calm wind.
Sunday Night
Mostly clear, with a low around 75. Calm wind.
Monday
Sunny and hot, with a high near 99. Calm wind.
Monday Night
Mostly clear, with a low around 76. Calm wind.
Tuesday
Sunny and hot, with a high near 99. Calm wind.
Tuesday Night
A slight chance of showers, with thunderstorms also possible after 1am. Mostly clear, with a low around 74. Calm wind.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 94. Calm wind becoming north northwest around 5 mph in the afternoon.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 70. Light north northeast wind.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 90. Calm wind becoming north northeast around 6 mph in the morning.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Vienna IL
 37.42°N 88.88°W
Last Update:
10:16 am CDT Aug 15, 2025
Forecast Valid:
11am CDT Aug 15, 2025-6pm CDT Aug 21, 2025
 
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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