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

78°F

26°C

Humidity 98%
Wind Speed S 3 mph
Barometer 30.06 in
Dewpoint 78°F (26°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 15 Aug 3:15 am CDT
Extended Forecast for

8 Miles NW Goreville IL

Extreme Heat Warning August 15, 03:24am until August 16, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 15, 03:24am until August 16, 08:00pm

    NOW until 8:00pm Sun

    Extreme Heat Warning

  • Overnight

    Low: 79 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 96. Heat index values as high as 105. South southwest wind around 6 mph.

    High: 96 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 77. South southwest wind 3 to 6 mph.

    Low: 77 °F

    Clear

  • Sunday

    Sunday: Mostly sunny and hot, with a high near 98. Heat index values as high as 107. West wind around 6 mph.

    High: 98 °F

    Hot

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74. Light west northwest wind.

    Low: 74 °F

    Chance
    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. North northwest wind 5 to 7 mph.

    High: 88 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 69. Light north northeast wind.

    Low: 69 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 90. Calm wind.

    High: 90 °F

    Sunny

Detailed Forecast

Overnight
Clear, with a steady temperature around 79. South southwest wind 3 to 5 mph.
Saturday
Sunny, with a high near 96. Heat index values as high as 105. South southwest wind around 6 mph.
Saturday Night
Clear, with a low around 77. South southwest wind 3 to 6 mph.
Sunday
Mostly sunny and hot, with a high near 98. Heat index values as high as 107. West wind around 6 mph.
Sunday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74. Light west northwest wind.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. North northwest wind 5 to 7 mph.
Monday Night
Partly cloudy, with a low around 69. Light north northeast wind.
Tuesday
Sunny, with a high near 90. Calm wind.
Tuesday Night
Mostly clear, with a low around 73. Calm wind becoming south around 6 mph after midnight.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 94. South southwest wind 7 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 71. North wind 6 to 8 mph.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 85. North northeast wind 5 to 7 mph.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 66. Northeast wind 3 to 5 mph.
Friday
A slight chance of showers and thunderstorms. 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:
8 Miles NW Goreville IL
 37.63°N 89.09°W
Last Update:
1:26 am CDT Aug 15, 2026
Forecast Valid:
3am 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