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.

Fair

88°F

31°C

Humidity 62%
Wind Speed SW 7 mph
Barometer 30.09 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index96°F (36°C)
Last update 1 Sep 9:45 am CDT
Extended Forecast for

Tunnel Hill IL

Heat Advisory September 1, 10:42am until September 4, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 1, 10:42am until September 4, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • Today

    High: 96 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 75. Calm wind.

    Low: 75 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 96. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 96 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 73. Calm wind.

    Low: 73 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 96. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 96 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 76. Calm wind.

    Low: 76 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 96. Light and variable wind.

    High: 96 °F

    Sunny

  • Friday Night

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

    Low: 76 °F

    Mostly Clear

Detailed Forecast

Today
Sunny, with a high near 96. South southwest wind 3 to 5 mph.
Tonight
Clear, with a low around 75. Calm wind.
Wednesday
Sunny, with a high near 96. Calm wind becoming south southwest around 6 mph in the afternoon.
Wednesday Night
Clear, with a low around 73. Calm wind.
Thursday
Sunny, with a high near 96. Calm wind becoming south southwest around 6 mph in the afternoon.
Thursday Night
Clear, with a low around 76. Calm wind.
Friday
Sunny, with a high near 96. Light and variable wind.
Friday Night
Mostly clear, with a low around 76. Calm wind.
Saturday
Sunny, with a high near 96. Calm wind.
Saturday Night
A slight chance of showers and thunderstorms after 1am. Mostly clear, with a low around 73. Calm wind.
Sunday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 94. Calm wind becoming north northeast around 5 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 71. Calm wind.
Labor Day
Sunny, with a high near 91. Calm wind becoming east northeast around 6 mph in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Tunnel Hill IL
 37.58°N 88.87°W
Last Update:
9:31 am CDT Sep 1, 2026
Forecast Valid:
10am CDT Sep 1, 2026-6pm CDT Sep 7, 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