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

63°F

17°C

Humidity 55%
Wind Speed S 15 G 21 mph
Barometer 30.11 in
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 30 Mar 1:55 am CDT
Extended Forecast for

Marion IL

  • Overnight

    Overnight: Mostly clear, with a low around 59. South wind around 11 mph, with gusts as high as 21 mph.

    Low: 59 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 80. Breezy, with a south southwest wind 13 to 21 mph, with gusts as high as 32 mph.

    High: 80 °F

    Mostly Sunny
    and Breezy

  • Monday Night

    Monday Night: Increasing clouds, with a low around 65. South southwest wind 13 to 16 mph, with gusts as high as 26 mph.

    Low: 65 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly sunny, with a high near 84. Breezy, with a south southwest wind 14 to 22 mph, with gusts as high as 34 mph.

    High: 84 °F

    Mostly Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 64. South southwest wind 9 to 15 mph, with gusts as high as 25 mph.

    Low: 64 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: Showers likely, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. South southwest wind 7 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 70%.

    High: 82 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66. South wind 9 to 13 mph, with gusts as high as 23 mph.

    Low: 66 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 79. South wind 14 to 17 mph, with gusts as high as 29 mph.

    High: 79 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Mostly cloudy, with a low around 63. South wind 13 to 17 mph, with gusts as high as 25 mph.

    Low: 63 °F

    Showers

Detailed Forecast

Overnight
Mostly clear, with a low around 59. South wind around 11 mph, with gusts as high as 21 mph.
Monday
Mostly sunny, with a high near 80. Breezy, with a south southwest wind 13 to 21 mph, with gusts as high as 32 mph.
Monday Night
Increasing clouds, with a low around 65. South southwest wind 13 to 16 mph, with gusts as high as 26 mph.
Tuesday
Mostly sunny, with a high near 84. Breezy, with a south southwest wind 14 to 22 mph, with gusts as high as 34 mph.
Tuesday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 64. South southwest wind 9 to 15 mph, with gusts as high as 25 mph.
Wednesday
Showers likely, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. South southwest wind 7 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 70%.
Wednesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66. South wind 9 to 13 mph, with gusts as high as 23 mph.
Thursday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 79. South wind 14 to 17 mph, with gusts as high as 29 mph.
Thursday Night
Showers and possibly a thunderstorm. Mostly cloudy, with a low around 63. South wind 13 to 17 mph, with gusts as high as 25 mph.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 77. South wind 9 to 11 mph, with gusts as high as 20 mph.
Friday Night
A chance of showers. Mostly cloudy, with a low around 61. South southeast wind 8 to 10 mph, with gusts as high as 18 mph.
Saturday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 72. South wind 11 to 15 mph becoming west in the afternoon. Winds could gust as high as 24 mph.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 44. West northwest wind 11 to 13 mph, with gusts as high as 20 mph.
Sunday
A chance of showers. Mostly sunny, with a high near 61. Northwest wind 11 to 14 mph, with gusts as high as 21 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:
1:26 am CDT Mar 30, 2026
Forecast Valid:
2am CDT Mar 30, 2026-6pm CDT Apr 5, 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