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.

Partly Cloudy

59°F

15°C

Humidity 88%
Wind Speed SW 14 G 23 mph
Barometer 29.73 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 18 Feb 7:45 am CST
Extended Forecast for

Marion IL

  • Today

    Today: Partly sunny, with a high near 73. Southwest wind 8 to 15 mph, with gusts as high as 21 mph.

    High: 73 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 54. South wind around 8 mph.

    Low: 54 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of showers before 9am, then a chance of showers and thunderstorms between 9am and noon, then showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 71. South southwest wind 7 to 16 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.

    High: 71 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before midnight. Mostly clear, with a low around 41. West wind 10 to 13 mph, with gusts as high as 23 mph.

    Low: 41 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 55. West wind 5 to 11 mph, with gusts as high as 20 mph.

    High: 55 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 35. Calm wind becoming north northeast around 5 mph after midnight.

    Low: 35 °F

    Partly Cloudy

  • Saturday

    Saturday: A 40 percent chance of showers, mainly after noon. Partly sunny, with a high near 48. North northeast wind 5 to 9 mph.

    High: 48 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of rain and snow showers before midnight. Partly cloudy, with a low around 26. North northwest wind 7 to 10 mph, with gusts as high as 20 mph.

    Low: 26 °F

    Chance
    Rain/Snow
    then Mostly
    Clear

  • Sunday

    Sunday: Sunny, with a high near 40. Northwest wind 10 to 14 mph, with gusts as high as 23 mph.

    High: 40 °F

    Sunny

Detailed Forecast

Today
Partly sunny, with a high near 73. Southwest wind 8 to 15 mph, with gusts as high as 21 mph.
Tonight
Partly cloudy, with a low around 54. South wind around 8 mph.
Thursday
A chance of showers before 9am, then a chance of showers and thunderstorms between 9am and noon, then showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 71. South southwest wind 7 to 16 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.
Thursday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 41. West wind 10 to 13 mph, with gusts as high as 23 mph.
Friday
Sunny, with a high near 55. West wind 5 to 11 mph, with gusts as high as 20 mph.
Friday Night
Partly cloudy, with a low around 35. Calm wind becoming north northeast around 5 mph after midnight.
Saturday
A 40 percent chance of showers, mainly after noon. Partly sunny, with a high near 48. North northeast wind 5 to 9 mph.
Saturday Night
A chance of rain and snow showers before midnight. Partly cloudy, with a low around 26. North northwest wind 7 to 10 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 40. Northwest wind 10 to 14 mph, with gusts as high as 23 mph.
Sunday Night
Mostly clear, with a low around 21. North northwest wind 7 to 9 mph.
Monday
Sunny, with a high near 39. North northwest wind 5 to 9 mph.
Monday Night
Mostly clear, with a low around 20. Light and variable wind.
Tuesday
Mostly sunny, with a high near 46. Calm wind becoming south 5 to 9 mph in the morning.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
5:46 am CST Feb 18, 2026
Forecast Valid:
8am CST Feb 18, 2026-6pm CST Feb 24, 2026
 
Forecast Discussion
 
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Additional Resources

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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