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

74°F

23°C

Humidity 75%
Wind Speed Calm
Barometer 30.05 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 30 Aug 11:15 pm CDT
Extended Forecast for

4 Miles NNW Tunnel Hill IL

Heat Advisory August 31, 10:00am until September 4, 08:00pm
Click here for hazard details and duration
Heat Advisory

  • Tonight

    Tonight: Mostly clear, with a steady temperature around 74. South wind 3 to 6 mph.

    Low: 74 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 94. South southwest wind 5 to 10 mph.

    High: 94 °F

    Sunny

  • Monday Night

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

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 95. Southwest wind 3 to 6 mph.

    High: 95 °F

    Sunny

  • Tuesday Night

    Tuesday Night: 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 5 to 7 mph in the morning.

    High: 96 °F

    Sunny

  • Wednesday Night

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

    Low: 76 °F

    Clear

  • Thursday

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

    High: 96 °F

    Sunny

  • Thursday Night

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

    Low: 75 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a steady temperature around 74. South wind 3 to 6 mph.
Monday
Sunny, with a high near 94. South southwest wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 75. Light south wind.
Tuesday
Sunny, with a high near 95. Southwest wind 3 to 6 mph.
Tuesday Night
Clear, with a low around 75. Calm wind.
Wednesday
Sunny, with a high near 96. Calm wind becoming south southwest 5 to 7 mph in the morning.
Wednesday Night
Clear, with a low around 76. Calm wind.
Thursday
Sunny, with a high near 96. Calm wind becoming southwest around 6 mph in the morning.
Thursday Night
Mostly clear, with a low around 75. Calm wind.
Friday
A slight chance of showers, with thunderstorms also possible after 1pm. Sunny, with a high near 95. Light and variable wind.
Friday Night
Mostly clear, with a low around 73. Calm wind.
Saturday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 93. Calm wind becoming north around 6 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 70. East northeast wind 5 to 10 mph becoming light after midnight.
Sunday
Sunny, with a high near 90. Calm wind becoming northeast 5 to 8 mph in the morning.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNW Tunnel Hill IL
 37.6°N 88.9°W
Last Update:
10:51 pm CDT Aug 30, 2026
Forecast Valid:
11pm CDT Aug 30, 2026-6pm CDT Sep 6, 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