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

N/A

Humidity NA
Wind Speed Calm
Barometer 30.04 in
Dewpoint N/A
Visibility 10.00 mi
Last update 17 Aug 5:55 am CDT
Extended Forecast for

4 Miles NW Tunnel Hill IL

Heat Advisory August 17, 06:15am until August 19, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 17, 06:15am until August 19, 07:00pm

    NOW until 7:00pm Tue

    Heat Advisory

  • Today

    High: 99 °F

    Sunny then
    Slight Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 75. Calm wind.

    Low: 75 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Sunny and hot, with a high near 97. Heat index values as high as 106. Calm wind.

    High: 97 °F

    Hot

  • Monday Night

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

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 96. Light and variable wind.

    High: 96 °F

    Sunny then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. Calm wind.

    Low: 73 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 88. Calm wind becoming north around 6 mph in the morning.

    High: 88 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 70. North northeast wind 3 to 6 mph.

    Low: 70 °F

    Partly Cloudy

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 99. Calm wind becoming east around 5 mph.
Tonight
A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 75. Calm wind.
Monday
Sunny and hot, with a high near 97. Heat index values as high as 106. Calm wind.
Monday Night
Mostly clear, with a low around 76. Calm wind.
Tuesday
A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 96. Light and variable wind.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. Calm wind.
Wednesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 88. Calm wind becoming north around 6 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 70. North northeast wind 3 to 6 mph.
Thursday
Mostly sunny, with a high near 86. North northeast wind 5 to 7 mph.
Thursday Night
Partly cloudy, with a low around 69. North northeast wind around 6 mph becoming calm in the evening.
Friday
Sunny, with a high near 89. Calm wind becoming north northeast around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 69. Light northeast wind.
Saturday
Sunny, with a high near 90. Calm wind becoming north around 5 mph in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NW Tunnel Hill IL
 37.6°N 88.93°W
Last Update:
5:46 am CDT Aug 17, 2025
Forecast Valid:
6am CDT Aug 17, 2025-6pm CDT Aug 23, 2025
 
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