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

64°F

18°C

Humidity 72%
Wind Speed S 7 mph
Barometer 29.97 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 1 Apr 1:55 am CDT
Extended Forecast for

Marion IL

  • Overnight

    Overnight: Partly cloudy, with a low around 65. South southwest wind around 9 mph, with gusts as high as 22 mph.

    Low: 65 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly before 3pm. Partly sunny, with a high near 83. South southwest wind 8 to 11 mph, with gusts as high as 20 mph.

    High: 83 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 67. South wind 8 to 14 mph, with gusts as high as 24 mph.

    Low: 67 °F

    Partly Cloudy

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 81. Breezy, with a south wind 15 to 21 mph, with gusts as high as 33 mph.

    High: 81 °F

    Breezy.
    Mostly Cloudy
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Low around 64. South southwest wind 9 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 80%.

    Low: 64 °F

    Showers

  • Friday

    Friday: Showers likely before 7am, then showers likely and possibly a thunderstorm between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82. South wind 8 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.

    High: 82 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers likely after 1am. Mostly cloudy, with a low around 60. South wind around 11 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.

    Low: 60 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday

    Saturday: Showers and possibly a thunderstorm. Mostly cloudy, with a high near 71. South wind 11 to 15 mph becoming west northwest in the afternoon. Winds could gust as high as 24 mph.

    High: 71 °F

    Showers

  • Saturday Night

    Saturday Night: A chance of showers, mainly before 1am. Mostly cloudy, with a low around 40. Northwest wind around 11 mph, with gusts as high as 20 mph.

    Low: 40 °F

    Chance
    Showers

Detailed Forecast

Overnight
Partly cloudy, with a low around 65. South southwest wind around 9 mph, with gusts as high as 22 mph.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly before 3pm. Partly sunny, with a high near 83. South southwest wind 8 to 11 mph, with gusts as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around 67. South wind 8 to 14 mph, with gusts as high as 24 mph.
Thursday
A 50 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 81. Breezy, with a south wind 15 to 21 mph, with gusts as high as 33 mph.
Thursday Night
Showers and possibly a thunderstorm. Low around 64. South southwest wind 9 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 80%.
Friday
Showers likely before 7am, then showers likely and possibly a thunderstorm between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82. South wind 8 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.
Friday Night
A chance of showers and thunderstorms, then showers likely after 1am. Mostly cloudy, with a low around 60. South wind around 11 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
Saturday
Showers and possibly a thunderstorm. Mostly cloudy, with a high near 71. South wind 11 to 15 mph becoming west northwest in the afternoon. Winds could gust as high as 24 mph.
Saturday Night
A chance of showers, mainly before 1am. Mostly cloudy, with a low around 40. Northwest wind around 11 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 57. North northwest wind 10 to 13 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 36. North wind 5 to 9 mph.
Monday
Sunny, with a high near 62. Northeast wind 5 to 7 mph.
Monday Night
Mostly clear, with a low around 40. East northeast wind around 5 mph becoming light and variable.
Tuesday
Sunny, with a high near 70. South wind 5 to 9 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:
1:48 am CDT Apr 1, 2026
Forecast Valid:
2am CDT Apr 1, 2026-6pm CDT Apr 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