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

59°F

15°C

Humidity 39%
Wind Speed NW 7 G 21 mph
Barometer 30.26 in
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Last update 5 Apr 4:45 pm CDT
Extended Forecast for

Marion IL

  • Tonight

    Tonight: Clear, with a low around 40. North northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 40 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 67. Calm wind becoming northwest 5 to 8 mph in the morning.

    High: 67 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 41. North northeast wind 5 to 7 mph.

    Low: 41 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 59. East northeast wind around 9 mph.

    High: 59 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 41. East southeast wind around 6 mph.

    Low: 41 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 74. South wind 6 to 10 mph, with gusts as high as 18 mph.

    High: 74 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 55. South wind 7 to 9 mph, with gusts as high as 18 mph.

    Low: 55 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 73. South wind 9 to 11 mph, with gusts as high as 21 mph.

    High: 73 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers after 1am. Partly cloudy, with a low around 58. South wind around 6 mph.

    Low: 58 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

Detailed Forecast

Tonight
Clear, with a low around 40. North northwest wind 5 to 7 mph becoming calm in the evening.
Monday
Sunny, with a high near 67. Calm wind becoming northwest 5 to 8 mph in the morning.
Monday Night
Partly cloudy, with a low around 41. North northeast wind 5 to 7 mph.
Tuesday
Mostly sunny, with a high near 59. East northeast wind around 9 mph.
Tuesday Night
Partly cloudy, with a low around 41. East southeast wind around 6 mph.
Wednesday
Mostly sunny, with a high near 74. South wind 6 to 10 mph, with gusts as high as 18 mph.
Wednesday Night
Partly cloudy, with a low around 55. South wind 7 to 9 mph, with gusts as high as 18 mph.
Thursday
Mostly sunny, with a high near 73. South wind 9 to 11 mph, with gusts as high as 21 mph.
Thursday Night
A slight chance of showers after 1am. Partly cloudy, with a low around 58. South wind around 6 mph.
Friday
A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 79. South southwest wind 6 to 9 mph.
Friday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 58. Southeast wind around 5 mph.
Saturday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 82. South wind 5 to 9 mph.
Saturday Night
A slight chance of showers. Mostly cloudy, with a low around 62. South southeast wind around 6 mph.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 83. South wind 7 to 14 mph, with gusts as high as 23 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
4:47 pm CDT Apr 5, 2026
Forecast Valid:
5pm CDT Apr 5, 2026-6pm CDT Apr 12, 2026
 
Forecast Discussion
 
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Additional Resources

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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