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.

Overcast

46°F

8°C

Humidity 82%
Wind Speed N 8 mph
Barometer 30.08 in
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 7 Mar 10:35 pm CDT
Extended Forecast for

Marion IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 41. Northwest wind 5 to 9 mph becoming calm after midnight. Winds could gust as high as 20 mph.

    Low: 41 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 66. Calm wind becoming southwest around 6 mph.

    High: 66 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 46. South wind 3 to 6 mph.

    Low: 46 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 74. South southwest wind 6 to 14 mph, with gusts as high as 24 mph.

    High: 74 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms after midnight. Partly cloudy, with a low around 62. South southwest wind 8 to 13 mph, with gusts as high as 21 mph.

    Low: 62 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Tuesday

    Tuesday: A slight chance of showers, then a chance of showers and thunderstorms after 9am. Mostly cloudy, with a high near 79. South southwest wind 8 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    High: 79 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after midnight. Cloudy, with a low around 63. South southwest wind 14 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 70%.

    Low: 63 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. Cloudy, with a high near 73. South southwest wind 15 to 17 mph becoming northwest in the afternoon. Winds could gust as high as 29 mph.

    High: 73 °F

    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers before midnight. Partly cloudy, with a low around 35. Northwest wind 14 to 17 mph, with gusts as high as 25 mph.

    Low: 35 °F

    Chance
    Showers then
    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 41. Northwest wind 5 to 9 mph becoming calm after midnight. Winds could gust as high as 20 mph.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 66. Calm wind becoming southwest around 6 mph.
Sunday Night
Clear, with a low around 46. South wind 3 to 6 mph.
Monday
Sunny, with a high near 74. South southwest wind 6 to 14 mph, with gusts as high as 24 mph.
Monday Night
A 20 percent chance of showers and thunderstorms after midnight. Partly cloudy, with a low around 62. South southwest wind 8 to 13 mph, with gusts as high as 21 mph.
Tuesday
A slight chance of showers, then a chance of showers and thunderstorms after 9am. Mostly cloudy, with a high near 79. South southwest wind 8 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after midnight. Cloudy, with a low around 63. South southwest wind 14 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 70%.
Wednesday
Showers and possibly a thunderstorm. Cloudy, with a high near 73. South southwest wind 15 to 17 mph becoming northwest in the afternoon. Winds could gust as high as 29 mph.
Wednesday Night
A chance of showers before midnight. Partly cloudy, with a low around 35. Northwest wind 14 to 17 mph, with gusts as high as 25 mph.
Thursday
Sunny, with a high near 56. Northwest wind 6 to 14 mph, with gusts as high as 20 mph.
Thursday Night
Mostly cloudy, with a low around 41. South wind 5 to 11 mph, with gusts as high as 21 mph.
Friday
Partly sunny, with a high near 67. Southwest wind 13 to 17 mph, with gusts as high as 28 mph.
Friday Night
Mostly cloudy, with a low around 42. Southwest wind 7 to 10 mph becoming northeast after midnight. Winds could gust as high as 18 mph.
Saturday
Partly sunny, with a high near 61. Northeast wind 8 to 11 mph becoming east southeast in the afternoon. Winds could gust as high as 20 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.95°W
Last Update:
8:31 pm CST Mar 7, 2026
Forecast Valid:
9pm CST Mar 7, 2026-6pm CDT Mar 14, 2026
 
Forecast Discussion
 
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Additional Resources

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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