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

82°F

28°C

Humidity 70%
Wind Speed SW 6 mph
Barometer 30.28 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 16 Sep 10:45 am CDT
Extended Forecast for

3 Miles NNE Vienna IL

Heat Advisory September 16, 11:16am until September 19, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 16, 11:16am until September 19, 07:00pm

    NOW until 7:00pm Sat

    Heat Advisory

  • Today

    High: 97 °F

    Hot

  • Tonight

    Tonight: Mostly clear, with a low around 73. Calm wind.

    Low: 73 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 97. Heat index values as high as 105. Calm wind becoming west southwest around 6 mph in the morning.

    High: 97 °F

    Hot

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 71. Calm wind.

    Low: 71 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 96. Calm wind.

    High: 96 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 71. Calm wind.

    Low: 71 °F

    Mostly Clear

  • Saturday

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

    High: 99 °F

    Hot

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 71. Calm wind.

    Low: 71 °F

    Partly Cloudy

Detailed Forecast

Today
Sunny and hot, with a high near 97. Heat index values as high as 105. South southwest wind around 7 mph.
Tonight
Mostly clear, with a low around 73. Calm wind.
Thursday
Sunny and hot, with a high near 97. Heat index values as high as 105. Calm wind becoming west southwest around 6 mph in the morning.
Thursday Night
Partly cloudy, with a low around 71. Calm wind.
Friday
Sunny, with a high near 96. Calm wind.
Friday Night
Mostly clear, with a low around 71. Calm wind.
Saturday
Sunny and hot, with a high near 99. Calm wind becoming southwest around 6 mph in the afternoon.
Saturday Night
Partly cloudy, with a low around 71. Calm wind.
Sunday
Mostly sunny, with a high near 95. Calm wind becoming west southwest around 6 mph in the morning.
Sunday Night
Partly cloudy, with a low around 70. Calm wind.
Monday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 91. Calm wind becoming west around 6 mph in the afternoon.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 66. Light north wind.
Tuesday
A slight chance of showers. Partly sunny, with a high near 86. Calm wind becoming north northeast around 5 mph in the afternoon.
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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:
4:25 am CDT Sep 16, 2026
Forecast Valid:
11am CDT Sep 16, 2026-6pm CDT Sep 22, 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