National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Mostly Cloudy

84°F

29°C

Humidity 62%
Wind Speed NW 10 mph
Barometer 30.03 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 17 Aug 4:22 pm CDT
Extended Forecast for

Marion IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 87. North northwest wind around 11 mph.

    High: 87 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 64. North northwest wind 5 to 8 mph becoming calm in the evening.

    Low: 64 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 88. Calm wind.

    High: 88 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers, with thunderstorms also possible after 4am. Increasing clouds, with a low around 68. Light south southeast wind. Chance of precipitation is 40%.

    Low: 68 °F

    Mostly Clear
    then Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers and thunderstorms before 7am, then showers likely and possibly a thunderstorm between 7am and 1pm. Partly sunny, with a high near 87. Light and variable wind becoming south around 6 mph in the morning. Chance of precipitation is 60%.

    High: 87 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Low around 68. Calm wind. Chance of precipitation is 80%.

    Low: 68 °F

    Showers

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 84. Calm wind becoming north northeast around 5 mph in the afternoon. Chance of precipitation is 60%.

    High: 84 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 65. Calm wind.

    Low: 65 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 85. Calm wind becoming north around 6 mph in the afternoon.

    High: 85 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 87. North northwest wind around 11 mph.
Tonight
Mostly clear, with a low around 64. North northwest wind 5 to 8 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 88. Calm wind.
Tuesday Night
A chance of showers, with thunderstorms also possible after 4am. Increasing clouds, with a low around 68. Light south southeast wind. Chance of precipitation is 40%.
Wednesday
A chance of showers and thunderstorms before 7am, then showers likely and possibly a thunderstorm between 7am and 1pm. Partly sunny, with a high near 87. Light and variable wind becoming south around 6 mph in the morning. Chance of precipitation is 60%.
Wednesday Night
Showers and possibly a thunderstorm. Low around 68. Calm wind. Chance of precipitation is 80%.
Thursday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 84. Calm wind becoming north northeast around 5 mph in the afternoon. Chance of precipitation is 60%.
Thursday Night
Partly cloudy, with a low around 65. Calm wind.
Friday
Sunny, with a high near 85. Calm wind becoming north around 6 mph in the afternoon.
Friday Night
Mostly clear, with a low around 65. Calm wind.
Saturday
Sunny, with a high near 86. Calm wind becoming northwest 5 to 9 mph in the morning.
Saturday Night
Mostly clear, with a low around 64. North wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 83. Calm wind becoming north 5 to 8 mph in the morning.
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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:
2:11 pm CDT Aug 17, 2026
Forecast Valid:
3pm CDT Aug 17, 2026-6pm CDT Aug 23, 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