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

46°F

8°C

Humidity 76%
Wind Speed Calm
Barometer 30.47 in
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Last update 17 Oct 7:15 pm CDT
Extended Forecast for

Marion IL

Frost Advisory October 18, 01:00am until October 18, 08:00am
Click here for hazard details and duration
Frost Advisory

  • Tonight

    Tonight: Areas of frost after 5am. Otherwise, clear, with a low around 34. Light and variable wind.

    Low: 34 °F

    Clear then
    Areas Frost

  • Sunday

    Sunday: Widespread frost, mainly between 7am and 8am. Otherwise, sunny, with a high near 69. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 69 °F

    Frost then
    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 38. Calm wind.

    Low: 38 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 73. Calm wind.

    High: 73 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 41. Calm wind.

    Low: 41 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 76. Calm wind becoming east northeast around 5 mph in the afternoon.

    High: 76 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 42. Calm wind.

    Low: 42 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 77. Calm wind.

    High: 77 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 45. Calm wind.

    Low: 45 °F

    Clear

Detailed Forecast

Tonight
Areas of frost after 5am. Otherwise, clear, with a low around 34. Light and variable wind.
Sunday
Widespread frost, mainly between 7am and 8am. Otherwise, sunny, with a high near 69. Calm wind becoming southeast around 5 mph in the afternoon.
Sunday Night
Clear, with a low around 38. Calm wind.
Monday
Sunny, with a high near 73. Calm wind.
Monday Night
Mostly clear, with a low around 41. Calm wind.
Tuesday
Sunny, with a high near 76. Calm wind becoming east northeast around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 42. Calm wind.
Wednesday
Sunny, with a high near 77. Calm wind.
Wednesday Night
Clear, with a low around 45. Calm wind.
Thursday
Sunny, with a high near 78. Calm wind becoming north northeast around 5 mph in the afternoon.
Thursday Night
Clear, with a low around 47. Calm wind.
Friday
Sunny, with a high near 78. Calm wind becoming east around 6 mph in the afternoon.
Friday Night
Mostly clear, with a low around 47. Calm wind.
Saturday
Sunny, with a high near 79. Calm wind becoming southeast around 6 mph in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
7:16 pm CDT Oct 17, 2026
Forecast Valid:
7pm CDT Oct 17, 2026-6pm CDT Oct 24, 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