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.

Fair

44°F

7°C

Humidity 79%
Wind Speed SE 7 mph
Barometer 30.03 in
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Wind Chill40°F (4°C)
Last update 16 Feb 10:55 pm CST
Extended Forecast for

Marion IL

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 42. Calm wind becoming south 5 to 7 mph after midnight.

    Low: 42 °F

    Patchy Fog

  • Tuesday

    Tuesday: Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 60. South wind 7 to 17 mph, with gusts as high as 30 mph.

    High: 60 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 58. Breezy, with a south wind 17 to 20 mph, with gusts as high as 31 mph.

    Low: 58 °F

    Mostly Cloudy
    and Breezy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 73. Southwest wind 8 to 16 mph, with gusts as high as 29 mph.

    High: 73 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers after midnight. Partly cloudy, with a low around 55. South wind 5 to 7 mph.

    Low: 55 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Thursday

    Thursday: A chance of showers, then showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 72. South wind 6 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    High: 72 °F

    Chance
    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: A 30 percent chance of showers before midnight. Mostly clear, with a low around 42. West wind 9 to 13 mph, with gusts as high as 21 mph.

    Low: 42 °F

    Chance
    Showers then
    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 56. West wind 6 to 11 mph, with gusts as high as 20 mph.

    High: 56 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A slight chance of showers. Partly cloudy, with a low around 35. Northwest wind 3 to 5 mph.

    Low: 35 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 42. Calm wind becoming south 5 to 7 mph after midnight.
Tuesday
Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 60. South wind 7 to 17 mph, with gusts as high as 30 mph.
Tuesday Night
Mostly cloudy, with a low around 58. Breezy, with a south wind 17 to 20 mph, with gusts as high as 31 mph.
Wednesday
Mostly sunny, with a high near 73. Southwest wind 8 to 16 mph, with gusts as high as 29 mph.
Wednesday Night
A 20 percent chance of showers after midnight. Partly cloudy, with a low around 55. South wind 5 to 7 mph.
Thursday
A chance of showers, then showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 72. South wind 6 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Thursday Night
A 30 percent chance of showers before midnight. Mostly clear, with a low around 42. West wind 9 to 13 mph, with gusts as high as 21 mph.
Friday
Mostly sunny, with a high near 56. West wind 6 to 11 mph, with gusts as high as 20 mph.
Friday Night
A slight chance of showers. Partly cloudy, with a low around 35. Northwest wind 3 to 5 mph.
Saturday
A slight chance of showers after noon. Mostly sunny, with a high near 51. North wind 3 to 8 mph.
Saturday Night
A chance of showers. Partly cloudy, with a low around 31. North northwest wind around 6 mph.
Sunday
Sunny, with a high near 45. Northwest wind 6 to 10 mph, with gusts as high as 18 mph.
Sunday Night
Mostly clear, with a low around 23. North northwest wind 5 to 7 mph.
Monday
Mostly sunny, with a high near 43. North northwest wind 5 to 7 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
10:47 pm CST Feb 16, 2026
Forecast Valid:
11pm CST Feb 16, 2026-6pm CST Feb 23, 2026
 
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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