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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Royalton IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 28. Southwest wind 3 to 6 mph.

    Low: 28 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 45. Light and variable wind.

    High: 45 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Cloudy, with a low around 34. Calm wind becoming south around 5 mph after midnight.

    Low: 34 °F

    Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 46. South wind 5 to 10 mph becoming north in the afternoon.

    High: 46 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A 30 percent chance of snow showers before midnight. Mostly cloudy, with a low around 23. North wind 7 to 10 mph.

    Low: 23 °F

    Chance Snow
    Showers then
    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 35. North wind 3 to 7 mph.

    High: 35 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 23. Calm wind becoming south southwest 5 to 9 mph after midnight.

    Low: 23 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 48. South southwest wind 10 to 14 mph, with gusts as high as 21 mph.

    High: 48 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 38. South southwest wind around 14 mph, with gusts as high as 21 mph.

    Low: 38 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 28. Southwest wind 3 to 6 mph.
Saturday
Mostly sunny, with a high near 45. Light and variable wind.
Saturday Night
Cloudy, with a low around 34. Calm wind becoming south around 5 mph after midnight.
Sunday
Mostly cloudy, with a high near 46. South wind 5 to 10 mph becoming north in the afternoon.
Sunday Night
A 30 percent chance of snow showers before midnight. Mostly cloudy, with a low around 23. North wind 7 to 10 mph.
Monday
Mostly sunny, with a high near 35. North wind 3 to 7 mph.
Monday Night
Partly cloudy, with a low around 23. Calm wind becoming south southwest 5 to 9 mph after midnight.
Tuesday
Mostly sunny, with a high near 48. South southwest wind 10 to 14 mph, with gusts as high as 21 mph.
Tuesday Night
Mostly cloudy, with a low around 38. South southwest wind around 14 mph, with gusts as high as 21 mph.
Wednesday
A chance of showers. Partly sunny, with a high near 48. West wind 10 to 15 mph, with gusts as high as 22 mph.
Wednesday Night
A slight chance of showers. Mostly cloudy, with a low around 27. West northwest wind 7 to 9 mph.
Thursday
Mostly cloudy, with a high near 43. North wind 7 to 10 mph becoming south southwest in the afternoon.
Thursday Night
Mostly cloudy, with a low around 24. South southwest wind around 7 mph becoming northwest after midnight.
Friday
Partly sunny, with a high near 36. Northwest wind 7 to 11 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Royalton IL
 37.87°N 89.11°W
Last Update:
10:36 pm CST Dec 5, 2025
Forecast Valid:
1am CST Dec 6, 2025-6pm CST Dec 12, 2025
 
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