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.

Mostly Cloudy

48°F

9°C

Humidity 50%
Wind Speed NE 12 mph
Barometer 30.25 in
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 1 Mar 4:45 pm CST
Extended Forecast for

Marion IL

  • This Afternoon

    This Afternoon: Partly sunny, with a steady temperature around 47. North northeast wind around 11 mph, with gusts as high as 18 mph.

    High: 47 °F

    Partly Sunny

  • Tonight

    Tonight: Rain, mainly after 10pm. Low around 36. East northeast wind 8 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 100%.

    Low: 36 °F

    Rain

  • Monday

    Monday: Rain, mainly before 10am. High near 47. East northeast wind 6 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.

    High: 47 °F

    Rain then
    Slight Chance
    Rain

  • Monday Night

    Monday Night: Showers likely, mainly after midnight. Mostly cloudy, with a low around 43. Calm wind becoming east southeast around 6 mph after midnight. Chance of precipitation is 60%.

    Low: 43 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Tuesday

    Tuesday: A 40 percent chance of showers. Mostly cloudy, with a high near 72. South southwest wind 7 to 14 mph, with gusts as high as 24 mph.

    High: 72 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 60. South wind 7 to 9 mph.

    Low: 60 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 73. South southwest wind 9 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.

    High: 73 °F

    Showers
    Likely then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 59. South southwest wind around 9 mph.

    Low: 59 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: Showers, with thunderstorms also possible after noon. Mostly cloudy, with a high near 73. South southwest wind 9 to 13 mph, with gusts as high as 21 mph.

    High: 73 °F

    Showers

Detailed Forecast

This Afternoon
Partly sunny, with a steady temperature around 47. North northeast wind around 11 mph, with gusts as high as 18 mph.
Tonight
Rain, mainly after 10pm. Low around 36. East northeast wind 8 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 100%.
Monday
Rain, mainly before 10am. High near 47. East northeast wind 6 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.
Monday Night
Showers likely, mainly after midnight. Mostly cloudy, with a low around 43. Calm wind becoming east southeast around 6 mph after midnight. Chance of precipitation is 60%.
Tuesday
A 40 percent chance of showers. Mostly cloudy, with a high near 72. South southwest wind 7 to 14 mph, with gusts as high as 24 mph.
Tuesday Night
A 40 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 60. South wind 7 to 9 mph.
Wednesday
Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 73. South southwest wind 9 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 59. South southwest wind around 9 mph.
Thursday
Showers, with thunderstorms also possible after noon. Mostly cloudy, with a high near 73. South southwest wind 9 to 13 mph, with gusts as high as 21 mph.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. South wind around 8 mph.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 78. South southwest wind 9 to 16 mph, with gusts as high as 25 mph.
Friday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 55. South wind 8 to 10 mph, with gusts as high as 18 mph.
Saturday
Showers likely and possibly a thunderstorm. Cloudy, with a high near 67. Southwest wind 6 to 10 mph becoming north northwest in the afternoon.
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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:
4:16 pm CST Mar 1, 2026
Forecast Valid:
4pm CST Mar 1, 2026-6pm CST Mar 7, 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