Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Mostly Cloudy

82°F

28°C

Humidity 74%
Wind Speed S 14 mph
Barometer 29.75 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 21 Jun 5:45 pm CDT
Extended Forecast for

Marion IL

Tornado Watch June 21, 06:18pm until June 21, 09:00pm
Lake Wind Advisory until June 21, 07:00pm
Click here for hazard details and duration
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  •  
    Tornado Watch June 21, 06:18pm until June 21, 09:00pm
    Lake Wind Advisory until June 21, 07:00pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Tonight

    Low: 69 °F

    Heavy Rain

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms, mainly between 10am and noon.  Mostly cloudy, with a high near 80. North northwest wind 8 to 10 mph.

    High: 80 °F

    Chance
    T-storms then
    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 62. North wind 5 to 9 mph becoming calm  in the evening.

    Low: 62 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 83. Northeast wind 3 to 5 mph.

    High: 83 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 63. Light north wind.

    Low: 63 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 86. Calm wind becoming south around 5 mph.

    High: 86 °F

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms, then a chance of showers after 1am.  Mostly cloudy, with a low around 69. Calm wind.  Chance of precipitation is 30%.

    Low: 69 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: A chance of showers and thunderstorms, mainly after 1pm.  Mostly sunny, with a high near 88. Calm wind becoming west southwest around 5 mph in the afternoon.

    High: 88 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Showers and thunderstorms before 2am, then showers likely and possibly a thunderstorm between 2am and 4am, then a chance of showers and thunderstorms after 4am. Some of the storms could produce heavy rainfall. Low around 69. South wind 8 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.
Monday
A 30 percent chance of showers and thunderstorms, mainly between 10am and noon. Mostly cloudy, with a high near 80. North northwest wind 8 to 10 mph.
Monday Night
Partly cloudy, with a low around 62. North wind 5 to 9 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 83. Northeast wind 3 to 5 mph.
Tuesday Night
Mostly clear, with a low around 63. Light north wind.
Wednesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86. Calm wind becoming south around 5 mph.
Wednesday Night
A slight chance of showers and thunderstorms, then a chance of showers after 1am. Mostly cloudy, with a low around 69. Calm wind. Chance of precipitation is 30%.
Thursday
A chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 88. Calm wind becoming west southwest around 5 mph in the afternoon.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 67. Light and variable wind.
Friday
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. Calm wind becoming south around 5 mph in the afternoon.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Light south southwest wind.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 89. Southwest wind 5 to 10 mph.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 74. South wind 6 to 8 mph.
Sunday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 93. Breezy, with a south southwest wind 9 to 14 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 29 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.76°N 88.95°W
5:46 pm CDT Jun 21, 2026
6pm CDT Jun 21, 2026-6pm CDT Jun 28, 2026
 
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Additional Resources

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