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

28°F

-2°C

Humidity 86%
Wind Speed S 12 mph
Barometer 30.16 in
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill18°F (-8°C)
Last update 3 Dec 7:45 am CST
Extended Forecast for

Royalton IL

  • Today

    Today: Mostly sunny, with a high near 41. South southwest wind 5 to 10 mph.

    High: 41 °F

    Mostly Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 21. Light and variable wind becoming north 6 to 11 mph after midnight.

    Low: 21 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly sunny, with a high near 30. North wind 5 to 11 mph.

    High: 30 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A slight chance of snow showers after midnight, mixing with freezing rain after 3am. Mostly cloudy, with a low around 18. Light and variable wind. Chance of precipitation is 20%.

    Low: 18 °F

    Mostly Cloudy
    then Slight
    Chance Wintry
    Mix

  • Friday

    Friday: Mostly sunny, with a high near 41. Calm wind becoming south southwest around 6 mph in the morning.

    High: 41 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 26. Light southwest wind.

    Low: 26 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 43. Calm wind becoming west around 6 mph.

    High: 43 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 27. Calm wind becoming northeast around 5 mph after midnight.

    Low: 27 °F

    Mostly Cloudy

  • Sunday

    Sunday: A slight chance of showers after noon. Partly sunny, with a high near 42. Northeast wind 5 to 8 mph.

    High: 42 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

Detailed Forecast

Today
Mostly sunny, with a high near 41. South southwest wind 5 to 10 mph.
Tonight
Increasing clouds, with a low around 21. Light and variable wind becoming north 6 to 11 mph after midnight.
Thursday
Mostly sunny, with a high near 30. North wind 5 to 11 mph.
Thursday Night
A slight chance of snow showers after midnight, mixing with freezing rain after 3am. Mostly cloudy, with a low around 18. Light and variable wind. Chance of precipitation is 20%.
Friday
Mostly sunny, with a high near 41. Calm wind becoming south southwest around 6 mph in the morning.
Friday Night
Partly cloudy, with a low around 26. Light southwest wind.
Saturday
Partly sunny, with a high near 43. Calm wind becoming west around 6 mph.
Saturday Night
Mostly cloudy, with a low around 27. Calm wind becoming northeast around 5 mph after midnight.
Sunday
A slight chance of showers after noon. Partly sunny, with a high near 42. Northeast wind 5 to 8 mph.
Sunday Night
A slight chance of showers before midnight. Mostly cloudy, with a low around 25. North wind around 6 mph.
Monday
Partly sunny, with a high near 38. North northwest wind 5 to 7 mph becoming south southwest in the afternoon.
Monday Night
Partly cloudy, with a low around 27. South wind 3 to 7 mph.
Tuesday
Mostly sunny, with a high near 47. Southwest wind 7 to 11 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Royalton IL
 37.9°N 89.11°W
Last Update:
6:01 am CST Dec 3, 2025
Forecast Valid:
7am CST Dec 3, 2025-6pm CST Dec 9, 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