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

37°F

3°C

Humidity 84%
Wind Speed N 3 mph
Barometer 30.05 in
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Last update 28 Feb 5:15 am CST
Extended Forecast for

Marion IL

  • Today

    Today: Increasing clouds, with a high near 69. Light and variable wind becoming east northeast around 6 mph in the morning.

    High: 69 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A slight chance of showers between 7pm and midnight. Mostly cloudy, then gradually becoming mostly clear, with a low around 37. South southwest wind 5 to 10 mph becoming north after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 20%.

    Low: 37 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 50. North northeast wind around 10 mph, with gusts as high as 18 mph.

    High: 50 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A chance of rain showers before 9pm, then rain and snow showers likely between 9pm and 3am, then rain showers likely after 3am. Cloudy, with a low around 34. Northeast wind around 9 mph. Chance of precipitation is 70%.

    Low: 34 °F

    Chance
    Rain/Snow
    then
    Rain/Snow
    Likely

  • Monday

    Monday: A 50 percent chance of showers, mainly before noon. Cloudy, with a high near 46. East wind 7 to 10 mph, with gusts as high as 18 mph.

    High: 46 °F

    Chance
    Showers then
    Slight Chance
    Showers

  • Monday Night

    Monday Night: A 50 percent chance of showers. Cloudy, with a low around 40. East wind 6 to 10 mph becoming south after midnight. Winds could gust as high as 20 mph.

    Low: 40 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 65. South southwest wind 11 to 15 mph, with gusts as high as 25 mph.

    High: 65 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Showers likely, with thunderstorms also possible after midnight. Cloudy, with a low around 55. South southwest wind 8 to 10 mph, with gusts as high as 18 mph.

    Low: 55 °F

    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Cloudy, with a high near 69. South wind 8 to 11 mph, with gusts as high as 20 mph.

    High: 69 °F

    Showers
    Likely then
    Chance
    T-storms

Detailed Forecast

Today
Increasing clouds, with a high near 69. Light and variable wind becoming east northeast around 6 mph in the morning.
Tonight
A slight chance of showers between 7pm and midnight. Mostly cloudy, then gradually becoming mostly clear, with a low around 37. South southwest wind 5 to 10 mph becoming north after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 20%.
Sunday
Mostly cloudy, with a high near 50. North northeast wind around 10 mph, with gusts as high as 18 mph.
Sunday Night
A chance of rain showers before 9pm, then rain and snow showers likely between 9pm and 3am, then rain showers likely after 3am. Cloudy, with a low around 34. Northeast wind around 9 mph. Chance of precipitation is 70%.
Monday
A 50 percent chance of showers, mainly before noon. Cloudy, with a high near 46. East wind 7 to 10 mph, with gusts as high as 18 mph.
Monday Night
A 50 percent chance of showers. Cloudy, with a low around 40. East wind 6 to 10 mph becoming south after midnight. Winds could gust as high as 20 mph.
Tuesday
A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 65. South southwest wind 11 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Showers likely, with thunderstorms also possible after midnight. Cloudy, with a low around 55. South southwest wind 8 to 10 mph, with gusts as high as 18 mph.
Wednesday
Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Cloudy, with a high near 69. South wind 8 to 11 mph, with gusts as high as 20 mph.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 55. South wind around 9 mph.
Thursday
A chance of showers. Mostly cloudy, with a high near 71. South southwest wind 8 to 11 mph, with gusts as high as 20 mph.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 59. South wind 6 to 8 mph.
Friday
Showers and thunderstorms likely. Mostly cloudy, with a high near 74. South southwest wind 8 to 13 mph, with gusts as high as 20 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.95°W
Last Update:
5:01 am CST Feb 28, 2026
Forecast Valid:
5am CST Feb 28, 2026-6pm CST Mar 6, 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