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Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

79°F

26°C

Humidity 79%
Wind Speed SW 3 mph
Barometer 29.93 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 5 Sep 2:35 am CDT
Extended Forecast for

4 Miles ENE Vienna IL

Extreme Heat Warning September 5, 02:47am until September 5, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning September 5, 02:47am until September 5, 08:00pm

    NOW until 8:00pm Sat

    Extreme Heat Warning

  • Overnight

    Low: 74 °F

    Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 99. Heat index values as high as 108. Light and variable wind.

    High: 99 °F

    Hot

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 72. Light north wind.

    Low: 72 °F

    Chance
    T-storms then
    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 91. Northeast wind 5 to 8 mph.

    High: 91 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 65. Northeast wind 3 to 7 mph.

    Low: 65 °F

    Mostly Clear

  • Labor Day

    Labor Day: Sunny, with a high near 90. East northeast wind 3 to 6 mph.

    High: 90 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 66. Calm wind.

    Low: 66 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93. Calm wind becoming south around 6 mph in the morning.

    High: 93 °F

    Sunny

Detailed Forecast

Overnight
Clear, with a low around 74. Calm wind.
Saturday
Sunny and hot, with a high near 99. Heat index values as high as 108. Light and variable wind.
Saturday Night
A 40 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 72. Light north wind.
Sunday
Sunny, with a high near 91. Northeast wind 5 to 8 mph.
Sunday Night
Mostly clear, with a low around 65. Northeast wind 3 to 7 mph.
Labor Day
Sunny, with a high near 90. East northeast wind 3 to 6 mph.
Monday Night
Clear, with a low around 66. Calm wind.
Tuesday
Sunny, with a high near 93. Calm wind becoming south around 6 mph in the morning.
Tuesday Night
Mostly clear, with a low around 72. Calm wind becoming south around 6 mph after midnight.
Wednesday
Sunny, with a high near 96. South southwest wind 6 to 10 mph.
Wednesday Night
A slight chance of showers. Mostly clear, with a low around 72. Light south southwest wind.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 92. Light and variable wind becoming north northwest around 6 mph in the morning.
Thursday Night
A slight chance of showers. Partly cloudy, with a low around 65. Calm wind.
Friday
A slight chance of showers and thunderstorms. Sunny, with a high near 89. Calm wind becoming east around 5 mph in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles ENE Vienna IL
 37.44°N 88.82°W
Last Update:
1:26 am CDT Sep 5, 2026
Forecast Valid:
2am CDT Sep 5, 2026-6pm CDT Sep 11, 2026
 
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Additional Resources

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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