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.

Mostly Cloudy

73°F

23°C

Humidity 53%
Wind Speed NE 6 mph
Barometer 30.07 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 2 Sep 9:47 am CDT
Extended Forecast for

Marion IL

  • Today

    Today: Mostly sunny, with a high near 85. North wind 3 to 6 mph.

    High: 85 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 60. Light and variable wind.

    Low: 60 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 88. Calm wind becoming west southwest 5 to 8 mph in the afternoon.

    High: 88 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Increasing clouds, with a low around 60. Light and variable wind becoming northwest around 6 mph after midnight. Chance of precipitation is 60%.

    Low: 60 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: Partly sunny, with a high near 76. North northwest wind around 7 mph.

    High: 76 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 56. Light and variable wind.

    Low: 56 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 84. South southwest wind 6 to 10 mph becoming west northwest in the afternoon.

    High: 84 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 50. North wind 3 to 6 mph.

    Low: 50 °F

    Chance
    T-storms

  • Saturday

    Saturday: Sunny, with a high near 77. Calm wind becoming north 5 to 7 mph in the morning.

    High: 77 °F

    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 85. North wind 3 to 6 mph.
Tonight
Partly cloudy, with a low around 60. Light and variable wind.
Wednesday
Sunny, with a high near 88. Calm wind becoming west southwest 5 to 8 mph in the afternoon.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Increasing clouds, with a low around 60. Light and variable wind becoming northwest around 6 mph after midnight. Chance of precipitation is 60%.
Thursday
Partly sunny, with a high near 76. North northwest wind around 7 mph.
Thursday Night
Mostly clear, with a low around 56. Light and variable wind.
Friday
Mostly sunny, with a high near 84. South southwest wind 6 to 10 mph becoming west northwest in the afternoon.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 50. North wind 3 to 6 mph.
Saturday
Sunny, with a high near 77. Calm wind becoming north 5 to 7 mph in the morning.
Saturday Night
Mostly clear, with a low around 52. North wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 78. Calm wind becoming north northeast 5 to 7 mph in the morning.
Sunday Night
Partly cloudy, with a low around 53. North northeast wind around 5 mph becoming calm in the evening.
Monday
Mostly sunny, with a high near 79. East northeast wind 3 to 7 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
9:17 am CDT Sep 2, 2025
Forecast Valid:
10am CDT Sep 2, 2025-6pm CDT Sep 8, 2025
 
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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