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.

Overcast

44°F

7°C

Humidity 77%
Wind Speed Calm
Barometer 30.32 in
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 7 Apr 2:55 am CDT
Extended Forecast for

Marion IL

  • Overnight

    Overnight: Partly cloudy, with a low around 41. North northeast wind around 6 mph.

    Low: 41 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 59. East northeast wind 7 to 10 mph, with gusts as high as 18 mph.

    High: 59 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 39. East northeast wind 5 to 7 mph.

    Low: 39 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 74. East southeast wind 6 to 10 mph becoming south in the afternoon.

    High: 74 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 53. South wind 6 to 8 mph.

    Low: 53 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 76. South southwest wind 8 to 10 mph, with gusts as high as 18 mph.

    High: 76 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 54. South wind around 6 mph.

    Low: 54 °F

    Mostly Clear

  • Friday

    Friday: A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 78. South southwest wind 6 to 10 mph.

    High: 78 °F

    Sunny then
    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 58. Light and variable wind.

    Low: 58 °F

    Slight Chance
    T-storms

Detailed Forecast

Overnight
Partly cloudy, with a low around 41. North northeast wind around 6 mph.
Tuesday
Mostly sunny, with a high near 59. East northeast wind 7 to 10 mph, with gusts as high as 18 mph.
Tuesday Night
Mostly clear, with a low around 39. East northeast wind 5 to 7 mph.
Wednesday
Mostly sunny, with a high near 74. East southeast wind 6 to 10 mph becoming south in the afternoon.
Wednesday Night
Mostly clear, with a low around 53. South wind 6 to 8 mph.
Thursday
Sunny, with a high near 76. South southwest wind 8 to 10 mph, with gusts as high as 18 mph.
Thursday Night
Mostly clear, with a low around 54. South wind around 6 mph.
Friday
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 78. South southwest wind 6 to 10 mph.
Friday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 58. Light and variable wind.
Saturday
Mostly sunny, with a high near 81. Light and variable wind becoming south southeast around 6 mph in the morning.
Saturday Night
Partly cloudy, with a low around 60. Southeast wind around 5 mph.
Sunday
Mostly sunny, with a high near 84. South wind 6 to 15 mph, with gusts as high as 25 mph.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. South wind 11 to 13 mph, with gusts as high as 24 mph.
Monday
A chance of showers and thunderstorms. Partly sunny, with a high near 82. South southwest wind 14 to 18 mph, with gusts as high as 29 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:
2:31 am CDT Apr 7, 2026
Forecast Valid:
3am CDT Apr 7, 2026-6pm CDT Apr 13, 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