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

65°F

18°C

Humidity 98%
Wind Speed Calm
Barometer 30.03 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 20 Jun 4:35 am CDT
Extended Forecast for

Marion IL

  • Today

    Today: Mostly sunny, with a high near 88. Calm wind becoming west southwest around 5 mph in the afternoon.

    High: 88 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 67. Calm wind.

    Low: 67 °F

    Mostly Clear

  • Sunday

    Sunday: Showers and thunderstorms likely before 4pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 87. Light southeast wind becoming south 12 to 17 mph in the morning. Winds could gust as high as 28 mph. Chance of precipitation is 70%.

    High: 87 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm. Low around 70. South southwest wind 10 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 100%.

    Low: 70 °F

    T-storms then
    Showers

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 81. West northwest wind 8 to 10 mph.

    High: 81 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63. North wind 5 to 8 mph becoming calm in the evening.

    Low: 63 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 82. Light north northeast wind.

    High: 82 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 85. Light and variable wind.

    High: 85 °F

    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 88. Calm wind becoming west southwest around 5 mph in the afternoon.
Tonight
Mostly clear, with a low around 67. Calm wind.
Sunday
Showers and thunderstorms likely before 4pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 87. Light southeast wind becoming south 12 to 17 mph in the morning. Winds could gust as high as 28 mph. Chance of precipitation is 70%.
Sunday Night
Showers and possibly a thunderstorm. Low around 70. South southwest wind 10 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 100%.
Monday
A 40 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 81. West northwest wind 8 to 10 mph.
Monday Night
Partly cloudy, with a low around 63. North wind 5 to 8 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 82. Light north northeast wind.
Tuesday Night
Mostly clear, with a low around 64. Calm wind.
Wednesday
Sunny, with a high near 85. Light and variable wind.
Wednesday Night
Mostly clear, with a low around 64. Calm wind.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 84. Calm wind becoming west around 6 mph in the afternoon.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 64. Calm wind.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 84. Calm wind becoming south southwest 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:
1:26 am CDT Jun 20, 2026
Forecast Valid:
4am CDT Jun 20, 2026-6pm CDT Jun 26, 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