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

86°F

30°C

Humidity 70%
Wind Speed N 15 mph
Barometer 30.14 in
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index95°F (35°C)
Last update 15 Aug 10:45 am CDT
Extended Forecast for

3 Miles SE Tunnel Hill IL

Extreme Heat Warning August 15, 10:59am until August 16, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 15, 10:59am until August 16, 08:00pm

    NOW until 8:00pm Sun

    Extreme Heat Warning

  • Today

    High: 95 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 74. South southwest wind 3 to 6 mph.

    Low: 74 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 96. Southwest wind 5 to 7 mph.

    High: 96 °F

    Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 73. Light and variable wind.

    Low: 73 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms, mainly between 10am and 1pm. Partly sunny, with a high near 87. North northwest wind 5 to 7 mph.

    High: 87 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Mostly clear, with a low around 67. Light north wind.

    Low: 67 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 89. Calm wind.

    High: 89 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 70. Light southeast wind.

    Low: 70 °F

    Partly Cloudy

Detailed Forecast

Today
Sunny, with a high near 95. Southwest wind around 7 mph.
Tonight
Clear, with a low around 74. South southwest wind 3 to 6 mph.
Sunday
Sunny, with a high near 96. Southwest wind 5 to 7 mph.
Sunday Night
A 20 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 73. Light and variable wind.
Monday
A 20 percent chance of showers and thunderstorms, mainly between 10am and 1pm. Partly sunny, with a high near 87. North northwest wind 5 to 7 mph.
Monday Night
Mostly clear, with a low around 67. Light north wind.
Tuesday
Sunny, with a high near 89. Calm wind.
Tuesday Night
Partly cloudy, with a low around 70. Light southeast wind.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 92. South wind 5 to 8 mph becoming west southwest in the afternoon.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 69. North wind around 6 mph.
Thursday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 84. North northeast wind 5 to 7 mph.
Thursday Night
Partly cloudy, with a low around 65. Northeast wind 3 to 5 mph.
Friday
Mostly sunny, with a high near 84. Northeast wind 3 to 6 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE Tunnel Hill IL
 37.53°N 88.85°W
Last Update:
10:16 am CDT Aug 15, 2026
Forecast Valid:
10am CDT Aug 15, 2026-6pm CDT Aug 21, 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