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Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Partly Cloudy

N/A

Humidity NA
Wind Speed E 5 mph
Barometer 30.00 in
Dewpoint N/A
Visibility 10.00 mi
Last update 17 Aug 7:15 pm CDT
Extended Forecast for

3 Miles W Marion IL

Heat Advisory August 17, 07:34pm until August 19, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 17, 07:34pm until August 19, 07:00pm

    NOW until 7:00pm Tue

    Heat Advisory

  • Tonight

    Low: 75 °F

    Partly Cloudy

  • Monday

    Monday: Sunny and hot, with a high near 98. Heat index values as high as 111. Light southeast wind.

    High: 98 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 74. Light east southeast wind.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96. Heat index values as high as 105. Calm wind becoming west around 5 mph in the afternoon.

    High: 96 °F

    Sunny then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 73. Calm wind. Chance of precipitation is 40%.

    Low: 73 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 10am. Partly sunny, with a high near 89. Calm wind becoming north 5 to 8 mph in the morning. Chance of precipitation is 30%.

    High: 89 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 69. North northeast wind 5 to 7 mph.

    Low: 69 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 88. North northeast wind 6 to 9 mph.

    High: 88 °F

    Mostly Sunny

Detailed Forecast

Tonight
Partly cloudy, with a low around 75. Light east wind.
Monday
Sunny and hot, with a high near 98. Heat index values as high as 111. Light southeast wind.
Monday Night
Mostly clear, with a low around 74. Light east southeast wind.
Tuesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96. Heat index values as high as 105. Calm wind becoming west around 5 mph in the afternoon.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 73. Calm wind. Chance of precipitation is 40%.
Wednesday
A chance of showers, with thunderstorms also possible after 10am. Partly sunny, with a high near 89. Calm wind becoming north 5 to 8 mph in the morning. Chance of precipitation is 30%.
Wednesday Night
Partly cloudy, with a low around 69. North northeast wind 5 to 7 mph.
Thursday
Mostly sunny, with a high near 88. North northeast wind 6 to 9 mph.
Thursday Night
Mostly clear, with a low around 68. North northeast wind 5 to 7 mph becoming calm in the evening.
Friday
Sunny, with a high near 90. Calm wind becoming north northeast around 6 mph in the morning.
Friday Night
Mostly clear, with a low around 68. North northeast wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 90. Calm wind becoming north northwest around 6 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 64. North wind around 6 mph becoming calm in the evening.
Sunday
Sunny, with a high near 85. North northwest wind 3 to 8 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles W Marion IL
 37.74°N 89°W
Last Update:
6:31 pm CDT Aug 17, 2025
Forecast Valid:
7pm CDT Aug 17, 2025-6pm CDT Aug 24, 2025
 
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