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.

Fair

48°F

9°C

Humidity 60%
Wind Speed S 6 mph
Barometer 30.09 in
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 19 Mar 1:55 am CDT
Extended Forecast for

Marion IL

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 47. South southwest wind 3 to 5 mph.

    Low: 47 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 73. South southwest wind 3 to 7 mph.

    High: 73 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 52. Calm wind becoming south around 5 mph after midnight.

    Low: 52 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 79. Southwest wind 6 to 9 mph.

    High: 79 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 54. South southwest wind around 6 mph becoming calm after midnight.

    Low: 54 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 80. Calm wind becoming north northwest around 5 mph in the afternoon.

    High: 80 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 58. Calm wind becoming south southwest around 6 mph after midnight.

    Low: 58 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 85. South southwest wind 7 to 14 mph, with gusts as high as 23 mph.

    High: 85 °F

    Sunny

  • Sunday Night

    Sunday Night: A slight chance of showers before 1am. Partly cloudy, with a low around 43. West southwest wind around 14 mph becoming north after midnight. Winds could gust as high as 23 mph.

    Low: 43 °F

    Slight Chance
    Showers

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 47. South southwest wind 3 to 5 mph.
Thursday
Mostly sunny, with a high near 73. South southwest wind 3 to 7 mph.
Thursday Night
Mostly clear, with a low around 52. Calm wind becoming south around 5 mph after midnight.
Friday
Sunny, with a high near 79. Southwest wind 6 to 9 mph.
Friday Night
Partly cloudy, with a low around 54. South southwest wind around 6 mph becoming calm after midnight.
Saturday
Sunny, with a high near 80. Calm wind becoming north northwest around 5 mph in the afternoon.
Saturday Night
Clear, with a low around 58. Calm wind becoming south southwest around 6 mph after midnight.
Sunday
Sunny, with a high near 85. South southwest wind 7 to 14 mph, with gusts as high as 23 mph.
Sunday Night
A slight chance of showers before 1am. Partly cloudy, with a low around 43. West southwest wind around 14 mph becoming north after midnight. Winds could gust as high as 23 mph.
Monday
Sunny, with a high near 58. North wind 10 to 13 mph, with gusts as high as 21 mph.
Monday Night
Partly cloudy, with a low around 36. Northeast wind 5 to 7 mph.
Tuesday
Partly sunny, with a high near 61. East southeast wind around 6 mph.
Tuesday Night
Mostly cloudy, with a low around 41. East wind 3 to 5 mph.
Wednesday
Mostly sunny, with a high near 71. East wind 5 to 10 mph becoming south in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
1:26 am CDT Mar 19, 2026
Forecast Valid:
2am CDT Mar 19, 2026-6pm CDT Mar 25, 2026
 
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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