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.

Fair

57°F

14°C

Humidity 25%
Wind Speed E 12 mph
Barometer 30.48 in
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Last update 28 Mar 3:47 pm CDT
Extended Forecast for

Marion IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 57. East southeast wind 3 to 5 mph.

    High: 57 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 39. Light south southeast wind.

    Low: 39 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 70. South southwest wind 6 to 15 mph, with gusts as high as 26 mph.

    High: 70 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 56. South wind 9 to 11 mph, with gusts as high as 24 mph.

    Low: 56 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 79. South southwest wind 11 to 18 mph, with gusts as high as 29 mph.

    High: 79 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 65. South southwest wind around 15 mph, with gusts as high as 25 mph.

    Low: 65 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 84. Breezy, with a south southwest wind 14 to 20 mph, with gusts as high as 31 mph.

    High: 84 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 51. South southwest wind 11 to 16 mph becoming north northwest after midnight. Winds could gust as high as 25 mph.

    Low: 51 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers. Mostly cloudy, with a high near 61. North wind 11 to 14 mph, with gusts as high as 22 mph.

    High: 61 °F

    Showers

Detailed Forecast

This Afternoon
Sunny, with a high near 57. East southeast wind 3 to 5 mph.
Tonight
Mostly clear, with a low around 39. Light south southeast wind.
Sunday
Mostly sunny, with a high near 70. South southwest wind 6 to 15 mph, with gusts as high as 26 mph.
Sunday Night
Partly cloudy, with a low around 56. South wind 9 to 11 mph, with gusts as high as 24 mph.
Monday
Mostly sunny, with a high near 79. South southwest wind 11 to 18 mph, with gusts as high as 29 mph.
Monday Night
Partly cloudy, with a low around 65. South southwest wind around 15 mph, with gusts as high as 25 mph.
Tuesday
Mostly sunny, with a high near 84. Breezy, with a south southwest wind 14 to 20 mph, with gusts as high as 31 mph.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 51. South southwest wind 11 to 16 mph becoming north northwest after midnight. Winds could gust as high as 25 mph.
Wednesday
Showers. Mostly cloudy, with a high near 61. North wind 11 to 14 mph, with gusts as high as 22 mph.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 47. Northeast wind around 11 mph, with gusts as high as 20 mph.
Thursday
Showers likely. Mostly cloudy, with a high near 65. East wind 11 to 14 mph, with gusts as high as 22 mph.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 49. East northeast wind 6 to 9 mph.
Friday
A chance of showers. Mostly cloudy, with a high near 72. East wind 7 to 10 mph becoming south in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
2:12 pm CDT Mar 28, 2026
Forecast Valid:
3pm CDT Mar 28, 2026-6pm CDT Apr 3, 2026
 
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Additional Resources

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Chance of Precipitation