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

77°F

25°C

Humidity 83%
Wind Speed SW 7 mph
Barometer 30.08 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 9 Sep 4:15 am CDT
Extended Forecast for

7 Miles NW Goreville IL

Heat Advisory September 9, 11:00am until September 9, 08:00pm
Click here for hazard details and duration
Heat Advisory

  • Today

    Today: A slight chance of showers between 11am and 1pm, then a chance of showers and thunderstorms after 1pm. Increasing clouds and hot, with a high near 98. Heat index values as high as 106. West southwest wind 7 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 40%.

    High: 98 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 73. Light and variable wind. Chance of precipitation is 60%.

    Low: 73 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: Showers and thunderstorms before 3pm, then showers likely and possibly a thunderstorm between 3pm and 4pm, then a chance of showers and thunderstorms after 4pm. High near 87. Calm wind becoming northwest around 6 mph in the afternoon. Chance of precipitation is 90%.

    High: 87 °F

    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 68. Light north northeast wind. Chance of precipitation is 30%.

    Low: 68 °F

    Chance
    Showers

  • Friday

    Friday: A chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers after 4pm. Partly sunny, with a high near 86. Calm wind. Chance of precipitation is 30%.

    High: 86 °F

    Partly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 68. Calm wind.

    Low: 68 °F

    Partly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 91 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 70. Calm wind.

    Low: 70 °F

    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 91 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
A slight chance of showers between 11am and 1pm, then a chance of showers and thunderstorms after 1pm. Increasing clouds and hot, with a high near 98. Heat index values as high as 106. West southwest wind 7 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 40%.
Tonight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 73. Light and variable wind. Chance of precipitation is 60%.
Thursday
Showers and thunderstorms before 3pm, then showers likely and possibly a thunderstorm between 3pm and 4pm, then a chance of showers and thunderstorms after 4pm. High near 87. Calm wind becoming northwest around 6 mph in the afternoon. Chance of precipitation is 90%.
Thursday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 68. Light north northeast wind. Chance of precipitation is 30%.
Friday
A chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers after 4pm. Partly sunny, with a high near 86. Calm wind. Chance of precipitation is 30%.
Friday Night
Partly cloudy, with a low around 68. Calm wind.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Calm wind becoming southwest around 5 mph in the afternoon.
Saturday Night
A chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 70. Calm wind.
Sunday
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Calm wind becoming south southwest around 6 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 71. Calm wind becoming south around 5 mph after midnight.
Monday
Sunny, with a high near 93. South southwest wind 6 to 10 mph.
Monday Night
Mostly clear, with a low around 72. South wind around 7 mph.
Tuesday
A chance of showers and thunderstorms. Sunny, with a high near 91. Southwest wind 6 to 8 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
7 Miles NW Goreville IL
 37.63°N 89.07°W
Last Update:
3:21 am CDT Sep 9, 2026
Forecast Valid:
4am CDT Sep 9, 2026-6pm CDT Sep 15, 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