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

27°F

-3°C

Humidity 96%
Wind Speed S 3 mph
Barometer 30.00 in
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Last update 31 Dec 11:55 pm CST
Extended Forecast for

Marion IL

  • Overnight

    Overnight: Mostly clear, with a low around 27. Light and variable wind.

    Low: 27 °F

    Mostly Clear

  • New Year's Day

    New Year's Day: Mostly sunny, with a high near 43. Calm wind becoming northeast around 6 mph in the afternoon.

    High: 43 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 30. Light northeast wind.

    Low: 30 °F

    Mostly Cloudy

  • Friday

    Friday: Cloudy, with a high near 45. Calm wind becoming east northeast around 6 mph in the morning.

    High: 45 °F

    Cloudy

  • Friday Night

    Friday Night: A 20 percent chance of showers. Cloudy, with a low around 31. Northeast wind 3 to 6 mph.

    Low: 31 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: Partly sunny, with a high near 43. North northeast wind 5 to 7 mph.

    High: 43 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 26. Light north wind.

    Low: 26 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 45. Calm wind becoming east northeast around 5 mph.

    High: 45 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 33. Calm wind becoming south 5 to 7 mph after midnight.

    Low: 33 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 27. Light and variable wind.
New Year's Day
Mostly sunny, with a high near 43. Calm wind becoming northeast around 6 mph in the afternoon.
Thursday Night
Mostly cloudy, with a low around 30. Light northeast wind.
Friday
Cloudy, with a high near 45. Calm wind becoming east northeast around 6 mph in the morning.
Friday Night
A 20 percent chance of showers. Cloudy, with a low around 31. Northeast wind 3 to 6 mph.
Saturday
Partly sunny, with a high near 43. North northeast wind 5 to 7 mph.
Saturday Night
Mostly clear, with a low around 26. Light north wind.
Sunday
Mostly sunny, with a high near 45. Calm wind becoming east northeast around 5 mph.
Sunday Night
Partly cloudy, with a low around 33. Calm wind becoming south 5 to 7 mph after midnight.
Monday
Sunny, with a high near 55. South southwest wind 7 to 11 mph, with gusts as high as 18 mph.
Monday Night
Mostly cloudy, with a low around 42. South southwest wind around 6 mph.
Tuesday
Mostly sunny, with a high near 60. South southwest wind 6 to 8 mph.
Tuesday Night
Partly cloudy, with a low around 39. South southwest wind around 6 mph becoming northwest after midnight.
Wednesday
Partly sunny, with a high near 55. Northwest wind 5 to 7 mph becoming south southwest 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:
11:17 pm CST Dec 31, 2025
Forecast Valid:
12am CST Jan 1, 2026-6pm CST Jan 7, 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