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.

Fog/Mist

40°F

4°C

Humidity 96%
Wind Speed E 5 mph
Barometer 30.20 in
Dewpoint 38°F (3°C)
Visibility 4.00 mi
Wind Chill36°F (2°C)
Last update 2 Mar 7:55 pm CST
Extended Forecast for

Marion IL

  • Tonight

    Tonight: A chance of showers before 3am, then a chance of showers and thunderstorms between 3am and 4am, then showers likely and possibly a thunderstorm after 4am. Patchy fog before 5am. Otherwise, cloudy, with a temperature rising to around 43 by 4am. East northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 40 °F⇑

    Patchy Fog
    then Showers
    Likely and
    Patchy Fog

  • Tuesday

    Tuesday: A 50 percent chance of showers, mainly between noon and 1pm. Mostly cloudy, with a high near 68. Light and variable wind becoming south southwest 5 to 10 mph in the morning.

    High: 68 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers, with thunderstorms also possible after 3am. Mostly cloudy, with a low around 55. South wind around 6 mph. Chance of precipitation is 50%.

    Low: 55 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 73. South southwest wind 6 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 70%.

    High: 73 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 59. South wind 6 to 8 mph. Chance of precipitation is 70%.

    Low: 59 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 73. Southwest wind 8 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 80%.

    High: 73 °F

    Showers

  • Thursday Night

    Thursday Night: A chance of showers, with thunderstorms also possible after midnight. Mostly cloudy, with a low around 59. South wind 5 to 7 mph. Chance of precipitation is 50%.

    Low: 59 °F

    Chance
    Showers then
    Chance
    T-storms

  • Friday

    Friday: A chance of showers and thunderstorms before noon, then a slight chance of showers. Mostly sunny, with a high near 79. South southwest wind 7 to 15 mph, with gusts as high as 25 mph.

    High: 79 °F

    Chance
    T-storms then
    Slight Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers, mainly after midnight. Partly cloudy, with a low around 62. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 62 °F

    Chance
    Showers

Detailed Forecast

Tonight
A chance of showers before 3am, then a chance of showers and thunderstorms between 3am and 4am, then showers likely and possibly a thunderstorm after 4am. Patchy fog before 5am. Otherwise, cloudy, with a temperature rising to around 43 by 4am. East northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Tuesday
A 50 percent chance of showers, mainly between noon and 1pm. Mostly cloudy, with a high near 68. Light and variable wind becoming south southwest 5 to 10 mph in the morning.
Tuesday Night
A chance of showers, with thunderstorms also possible after 3am. Mostly cloudy, with a low around 55. South wind around 6 mph. Chance of precipitation is 50%.
Wednesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 73. South southwest wind 6 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 70%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 59. South wind 6 to 8 mph. Chance of precipitation is 70%.
Thursday
Showers and possibly a thunderstorm. High near 73. Southwest wind 8 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 80%.
Thursday Night
A chance of showers, with thunderstorms also possible after midnight. Mostly cloudy, with a low around 59. South wind 5 to 7 mph. Chance of precipitation is 50%.
Friday
A chance of showers and thunderstorms before noon, then a slight chance of showers. Mostly sunny, with a high near 79. South southwest wind 7 to 15 mph, with gusts as high as 25 mph.
Friday Night
A chance of showers, mainly after midnight. Partly cloudy, with a low around 62. South wind around 10 mph, with gusts as high as 20 mph.
Saturday
Showers and possibly a thunderstorm before noon, then showers likely. Cloudy, with a high near 72. Southwest wind 7 to 11 mph, with gusts as high as 20 mph.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 52. Southwest wind 3 to 6 mph.
Sunday
A chance of showers. Mostly cloudy, with a high near 68. Southwest wind 3 to 8 mph.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 54. South southwest wind around 5 mph.
Monday
A chance of showers. Mostly sunny, with a high near 71. Southwest wind 5 to 10 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:
7:32 pm CST Mar 2, 2026
Forecast Valid:
8pm CST Mar 2, 2026-6pm CDT Mar 9, 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