National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Mostly Cloudy

45°F

7°C

Humidity 88%
Wind Speed Calm
Barometer 30.17 in
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Last update 18 Apr 8:55 pm CDT
Extended Forecast for

Marion IL

  • Tonight

    Tonight: Mostly clear, with a low around 39. Calm wind becoming west northwest around 5 mph.

    Low: 39 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 68. Light southwest wind becoming west 6 to 11 mph in the morning. Winds could gust as high as 20 mph.

    High: 68 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 42. West wind around 5 mph becoming light and variable after midnight.

    Low: 42 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 69. Light and variable wind becoming east around 5 mph.

    High: 69 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 50. Southeast wind 3 to 6 mph.

    Low: 50 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 78. Southwest wind 6 to 14 mph, with gusts as high as 23 mph.

    High: 78 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 55. Southwest wind 6 to 10 mph, with gusts as high as 18 mph.

    Low: 55 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 80. Southwest wind 5 to 10 mph.

    High: 80 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 60. South wind around 6 mph.

    Low: 60 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 39. Calm wind becoming west northwest around 5 mph.
Sunday
Sunny, with a high near 68. Light southwest wind becoming west 6 to 11 mph in the morning. Winds could gust as high as 20 mph.
Sunday Night
Mostly clear, with a low around 42. West wind around 5 mph becoming light and variable after midnight.
Monday
Sunny, with a high near 69. Light and variable wind becoming east around 5 mph.
Monday Night
Clear, with a low around 50. Southeast wind 3 to 6 mph.
Tuesday
Sunny, with a high near 78. Southwest wind 6 to 14 mph, with gusts as high as 23 mph.
Tuesday Night
Mostly clear, with a low around 55. Southwest wind 6 to 10 mph, with gusts as high as 18 mph.
Wednesday
Sunny, with a high near 80. Southwest wind 5 to 10 mph.
Wednesday Night
Mostly clear, with a low around 60. South wind around 6 mph.
Thursday
Sunny, with a high near 83. South wind 6 to 14 mph, with gusts as high as 23 mph.
Thursday Night
A chance of showers. Partly cloudy, with a low around 64. South wind around 10 mph, with gusts as high as 21 mph.
Friday
Showers and thunderstorms likely. Partly sunny, with a high near 78. South southwest wind 11 to 15 mph, with gusts as high as 25 mph.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 54. Southwest wind 8 to 11 mph, with gusts as high as 18 mph.
Saturday
A slight chance of showers. Mostly sunny, with a high near 73. North northwest wind 9 to 11 mph, with gusts as high as 18 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.95°W
Last Update:
8:51 pm CDT Apr 18, 2026
Forecast Valid:
9pm CDT Apr 18, 2026-6pm CDT Apr 25, 2026
 
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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