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

77°F

25°C

Humidity 66%
Wind Speed E 3 mph
Barometer 30.01 in
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 12 Jun 8:15 pm CDT
Extended Forecast for

Marion IL

  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms, mainly after midnight. Increasing clouds, with a low around 69. Calm wind.

    Low: 69 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Friday

    Friday: Showers and thunderstorms likely before 2pm, then showers and possibly a thunderstorm between 2pm and 3pm, then showers and thunderstorms likely after 3pm. High near 82. Light south southeast wind becoming south 5 to 9 mph in the morning. Chance of precipitation is 80%.

    High: 82 °F

    Showers
    Likely then
    T-storms

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 70. South wind 3 to 6 mph. Chance of precipitation is 60%.

    Low: 70 °F

    Showers
    Likely

  • Saturday

    Saturday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 81. Southwest wind 3 to 6 mph. Chance of precipitation is 80%.

    High: 81 °F

    Chance
    Showers then
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 70. Light and variable wind. Chance of precipitation is 30%.

    Low: 70 °F

    Chance
    Showers

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 10am. Partly sunny, with a high near 85. Calm wind becoming northwest around 5 mph. Chance of precipitation is 40%.

    High: 85 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 70. Calm wind. Chance of precipitation is 20%.

    Low: 70 °F

    Slight Chance
    T-storms

  • Monday

    Monday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86. Calm wind becoming southwest around 5 mph.

    High: 86 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Light southwest wind.

    Low: 71 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A 50 percent chance of showers and thunderstorms, mainly after midnight. Increasing clouds, with a low around 69. Calm wind.
Friday
Showers and thunderstorms likely before 2pm, then showers and possibly a thunderstorm between 2pm and 3pm, then showers and thunderstorms likely after 3pm. High near 82. Light south southeast wind becoming south 5 to 9 mph in the morning. Chance of precipitation is 80%.
Friday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 70. South wind 3 to 6 mph. Chance of precipitation is 60%.
Saturday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 81. Southwest wind 3 to 6 mph. Chance of precipitation is 80%.
Saturday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 70. Light and variable wind. Chance of precipitation is 30%.
Sunday
A chance of showers, with thunderstorms also possible after 10am. Partly sunny, with a high near 85. Calm wind becoming northwest around 5 mph. Chance of precipitation is 40%.
Sunday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 70. Calm wind. Chance of precipitation is 20%.
Monday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86. Calm wind becoming southwest around 5 mph.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Light southwest wind.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 88. South southwest wind 5 to 8 mph.
Tuesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 73. South wind around 6 mph.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 90. Southwest wind 7 to 11 mph, with gusts as high as 20 mph.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 75. South southwest wind 6 to 8 mph.
Juneteenth
A chance of showers and thunderstorms. Mostly sunny, with a high near 89. West southwest wind 6 to 8 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
7:31 pm CDT Jun 12, 2025
Forecast Valid:
8pm CDT Jun 12, 2025-6pm CDT Jun 19, 2025
 
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