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

81°F

27°C

Humidity 58%
Wind Speed E 5 mph
Barometer 30.01 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 30 Jul 7:15 pm CDT
Extended Forecast for

Marion IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 66. East wind around 5 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 89. Calm wind becoming south 5 to 8 mph in the morning. Chance of precipitation is 30%.

    High: 89 °F

    Mostly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 69. South southwest wind 6 to 8 mph. Chance of precipitation is 80%.

    Low: 69 °F

    Chance
    T-storms then
    Showers

  • Saturday

    Saturday: A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 83. West wind 9 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.

    High: 83 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Northwest wind 7 to 10 mph. Chance of precipitation is 30%.

    Low: 66 °F

    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82. North wind 9 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.

    High: 82 °F

    Slight Chance
    Showers then
    Chance
    Showers

  • Sunday Night

    Sunday Night: A 20 percent chance of showers before 1am. Partly cloudy, with a low around 66. North wind 5 to 9 mph becoming calm in the evening.

    Low: 66 °F

    Slight Chance
    Showers

  • Monday

    Monday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 85. North northeast wind 3 to 8 mph.

    High: 85 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly clear, with a low around 66. Northeast wind around 5 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 66. East wind around 5 mph becoming calm in the evening.
Friday
A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 89. Calm wind becoming south 5 to 8 mph in the morning. Chance of precipitation is 30%.
Friday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 69. South southwest wind 6 to 8 mph. Chance of precipitation is 80%.
Saturday
A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 83. West wind 9 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Northwest wind 7 to 10 mph. Chance of precipitation is 30%.
Sunday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82. North wind 9 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.
Sunday Night
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 66. North wind 5 to 9 mph becoming calm in the evening.
Monday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 85. North northeast wind 3 to 8 mph.
Monday Night
Mostly clear, with a low around 66. Northeast wind around 5 mph becoming calm in the evening.
Tuesday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Sunny, with a high near 88. Calm wind becoming north northeast around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 68. Calm wind.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 92. Calm wind becoming west northwest around 6 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 70. Calm wind.
Thursday
Sunny, with a high near 94. Calm wind becoming southeast around 6 mph in the afternoon.
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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:
5:51 pm CDT Jul 30, 2026
Forecast Valid:
7pm CDT Jul 30, 2026-6pm CDT Aug 6, 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