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.

A Few Clouds

66°F

19°C

Humidity 26%
Wind Speed NW 14 mph
Barometer 30.19 in
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 19 Apr 5:45 pm CDT
Extended Forecast for

Marion IL

  • Tonight

    Tonight: Mostly clear, with a low around 42. West northwest wind around 6 mph becoming calm in the evening.

    Low: 42 °F

    Mostly Clear

  • Monday

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

    High: 69 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 50. Calm wind becoming south around 6 mph after midnight.

    Low: 50 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77. Southwest wind 6 to 14 mph, with gusts as high as 24 mph.

    High: 77 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 55. Southwest wind 6 to 10 mph, with gusts as high as 20 mph.

    Low: 55 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 79. Southwest wind 6 to 10 mph.

    High: 79 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 57. South wind 5 to 7 mph.

    Low: 57 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 82. South wind 7 to 17 mph, with gusts as high as 26 mph.

    High: 82 °F

    Sunny

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 64. South wind around 14 mph, with gusts as high as 23 mph.

    Low: 64 °F

    Partly Cloudy
    then Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 42. West northwest wind around 6 mph becoming calm in the evening.
Monday
Sunny, with a high near 69. Calm wind becoming east around 5 mph.
Monday Night
Mostly clear, with a low around 50. Calm wind becoming south around 6 mph after midnight.
Tuesday
Mostly sunny, with a high near 77. Southwest wind 6 to 14 mph, with gusts as high as 24 mph.
Tuesday Night
Clear, with a low around 55. Southwest wind 6 to 10 mph, with gusts as high as 20 mph.
Wednesday
Sunny, with a high near 79. Southwest wind 6 to 10 mph.
Wednesday Night
Mostly clear, with a low around 57. South wind 5 to 7 mph.
Thursday
Sunny, with a high near 82. South wind 7 to 17 mph, with gusts as high as 26 mph.
Thursday Night
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 64. South wind around 14 mph, with gusts as high as 23 mph.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 78. South southwest wind 13 to 15 mph, with gusts as high as 24 mph.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 56. Southwest wind 6 to 8 mph becoming northwest after midnight.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 74. Northwest wind 7 to 10 mph.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 54. North northwest wind around 6 mph becoming east northeast after midnight.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 73. West wind 7 to 9 mph becoming north northwest in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.95°W
Last Update:
3:07 pm CDT Apr 19, 2026
Forecast Valid:
6pm CDT Apr 19, 2026-6pm CDT Apr 26, 2026
 
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Additional Resources

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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