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.

Partly Cloudy

75°F

24°C

Humidity 94%
Wind Speed S 8 mph
Barometer 30.05 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Last update 10 Aug 6:45 am CDT
Extended Forecast for

5 Miles W Simpson IL

Heat Advisory August 10, 07:00am until August 13, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 10, 07:00am until August 13, 08:00pm

    NOW until 8:00pm Thu

    Heat Advisory

  • Today

    High: 93 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 75. South southwest wind around 6 mph.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 94. Southwest wind 5 to 9 mph.

    High: 94 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 77. South southwest wind 5 to 8 mph.

    Low: 77 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. Southwest wind 5 to 8 mph.

    High: 94 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 76. South southwest wind around 6 mph.

    Low: 76 °F

    Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. Southwest wind around 6 mph.

    High: 94 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 75. South wind 3 to 5 mph.

    Low: 75 °F

    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 93. South southwest wind 6 to 9 mph.
Tonight
Mostly clear, with a low around 75. South southwest wind around 6 mph.
Tuesday
Sunny, with a high near 94. Southwest wind 5 to 9 mph.
Tuesday Night
Mostly clear, with a low around 77. South southwest wind 5 to 8 mph.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. Southwest wind 5 to 8 mph.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 76. South southwest wind around 6 mph.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. Southwest wind around 6 mph.
Thursday Night
A chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 75. South wind 3 to 5 mph.
Friday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 91. Southwest wind 3 to 6 mph.
Friday Night
A slight chance of showers and thunderstorms before 1am. Mostly clear, with a low around 73. South southeast wind 3 to 5 mph.
Saturday
Sunny, with a high near 93. South southwest wind 3 to 6 mph.
Saturday Night
Mostly clear, with a low around 74. Light south wind.
Sunday
Mostly sunny, with a high near 93. West southwest wind 3 to 6 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles W Simpson IL
 37.49°N 88.85°W
Last Update:
6:01 am CDT Aug 10, 2026
Forecast Valid:
7am CDT Aug 10, 2026-6pm CDT Aug 16, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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