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.

Light Rain

61°F

16°C

Humidity 100%
Wind Speed N 12 mph
Barometer 30.15 in
Dewpoint 61°F (16°C)
Visibility 5.00 mi
Last update 20 May 6:45 am CDT
Extended Forecast for

Marion IL

  • Today

    Today: Showers likely and possibly a thunderstorm before 1pm, then a slight chance of showers and thunderstorms between 1pm and 3pm. Cloudy, with a high near 69. North northeast wind 7 to 9 mph. Chance of precipitation is 60%.

    High: 69 °F

    Showers
    Likely then
    Chance
    Showers

  • Tonight

    Tonight: Mostly cloudy, with a low around 56. North northeast wind 5 to 9 mph becoming light northeast.

    Low: 56 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 74. Northeast wind 6 to 9 mph.

    High: 74 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm, mainly after 4am. Mostly cloudy, with a low around 60. East northeast wind 5 to 8 mph. Chance of precipitation is 70%.

    Low: 60 °F

    Mostly Cloudy
    then Showers
    Likely

  • Friday

    Friday: Showers and possibly a thunderstorm. High near 76. East wind 6 to 9 mph becoming south in the afternoon. Chance of precipitation is 90%.

    High: 76 °F

    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 63. Southwest wind 3 to 6 mph. Chance of precipitation is 50%.

    Low: 63 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82. Southwest wind 3 to 5 mph.

    High: 82 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 65. Calm wind.

    Low: 65 °F

    Chance
    T-storms

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 81. Calm wind becoming south southwest around 5 mph.

    High: 81 °F

    Showers
    Likely

Detailed Forecast

Today
Showers likely and possibly a thunderstorm before 1pm, then a slight chance of showers and thunderstorms between 1pm and 3pm. Cloudy, with a high near 69. North northeast wind 7 to 9 mph. Chance of precipitation is 60%.
Tonight
Mostly cloudy, with a low around 56. North northeast wind 5 to 9 mph becoming light northeast.
Thursday
Mostly cloudy, with a high near 74. Northeast wind 6 to 9 mph.
Thursday Night
Showers likely and possibly a thunderstorm, mainly after 4am. Mostly cloudy, with a low around 60. East northeast wind 5 to 8 mph. Chance of precipitation is 70%.
Friday
Showers and possibly a thunderstorm. High near 76. East wind 6 to 9 mph becoming south in the afternoon. Chance of precipitation is 90%.
Friday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 63. Southwest wind 3 to 6 mph. Chance of precipitation is 50%.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82. Southwest wind 3 to 5 mph.
Saturday Night
A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 65. Calm wind.
Sunday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 81. Calm wind becoming south southwest around 5 mph.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. Calm wind.
Memorial Day
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 81. Calm wind becoming southeast around 6 mph in the morning.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. South southeast wind around 5 mph becoming calm in the evening.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 84. South wind 3 to 8 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:
3:01 am CDT May 20, 2026
Forecast Valid:
7am CDT May 20, 2026-6pm CDT May 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