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 89%
Wind Speed S 8 mph
Barometer 30.07 in
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 15 Aug 4:55 am CDT
Extended Forecast for

Goreville IL

Extreme Heat Warning August 15, 05:05am until August 16, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 15, 05:05am 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 75. South southwest wind 5 to 7 mph.

    Low: 75 °F

    Clear

  • Sunday

    Sunday: Mostly sunny and hot, with a high near 97. Heat index values as high as 106. West southwest wind around 7 mph.

    High: 97 °F

    Hot

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. Light and variable wind becoming west northwest around 5 mph.

    Low: 73 °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 68. Light north northeast wind.

    Low: 68 °F

    Partly Cloudy

  • Tuesday

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

    High: 89 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 72. Calm wind becoming south around 6 mph after midnight.

    Low: 72 °F

    Mostly Clear

Detailed Forecast

Today
Sunny, with a high near 95. South southwest wind 5 to 7 mph.
Tonight
Clear, with a low around 75. South southwest wind 5 to 7 mph.
Sunday
Mostly sunny and hot, with a high near 97. Heat index values as high as 106. West southwest wind around 7 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. Light and variable wind becoming west northwest around 5 mph.
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 68. Light north northeast wind.
Tuesday
Sunny, with a high near 89. Calm wind.
Tuesday Night
Mostly clear, with a low around 72. Calm wind becoming south around 6 mph after midnight.
Wednesday
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. West 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 70. North wind 6 to 8 mph.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 85. North northeast wind around 7 mph.
Thursday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 65. Northeast wind around 6 mph.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 83. Northeast wind 5 to 7 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Goreville IL
 37.56°N 88.99°W
Last Update:
4:56 am CDT Aug 15, 2026
Forecast Valid:
5am CDT Aug 15, 2026-6pm CDT Aug 21, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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