National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heavy Rain and Thunderstorms in the Plains; Snow in the Northern Rockies

A storm system moving eastward will bring widespread showers and thunderstorms over parts of the Northern Plains to the Southern Plains and Upper Great Lakes through Friday. Heavy snow will continue over parts of the Northern Rockies. Read More >

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

66°F

19°C

Humidity 76%
Wind Speed Calm
Barometer 30.13 in
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 15 Oct 8:55 pm CDT
Extended Forecast for

Royalton IL

  • Tonight

    Tonight: Mostly clear, with a low around 57. Calm wind.

    Low: 57 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 82. Light east wind increasing to 5 to 10 mph in the morning.

    High: 82 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 55. East southeast wind around 7 mph.

    Low: 55 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 80. South southeast wind 6 to 10 mph.

    High: 80 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 62. South southeast wind around 7 mph.

    Low: 62 °F

    Partly Cloudy

  • Saturday

    Saturday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 82. South southwest wind 10 to 17 mph, with gusts as high as 23 mph. Chance of precipitation is 70%.

    High: 82 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 52. Southwest wind 10 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.

    Low: 52 °F

    Showers

  • Sunday

    Sunday: A chance of showers, mainly before 1pm. Mostly sunny, with a high near 66. West northwest wind 14 to 17 mph, with gusts as high as 23 mph.

    High: 66 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 43. West southwest wind 5 to 9 mph.

    Low: 43 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 57. Calm wind.
Thursday
Sunny, with a high near 82. Light east wind increasing to 5 to 10 mph in the morning.
Thursday Night
Partly cloudy, with a low around 55. East southeast wind around 7 mph.
Friday
Partly sunny, with a high near 80. South southeast wind 6 to 10 mph.
Friday Night
Partly cloudy, with a low around 62. South southeast wind around 7 mph.
Saturday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 82. South southwest wind 10 to 17 mph, with gusts as high as 23 mph. Chance of precipitation is 70%.
Saturday Night
Showers and possibly a thunderstorm. Low around 52. Southwest wind 10 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Sunday
A chance of showers, mainly before 1pm. Mostly sunny, with a high near 66. West northwest wind 14 to 17 mph, with gusts as high as 23 mph.
Sunday Night
Mostly clear, with a low around 43. West southwest wind 5 to 9 mph.
Monday
Sunny, with a high near 72. South southwest wind 6 to 14 mph, with gusts as high as 18 mph.
Monday Night
Mostly clear, with a low around 51. Southwest wind 7 to 10 mph.
Tuesday
A slight chance of showers. Sunny, with a high near 75. West southwest wind 10 to 15 mph, with gusts as high as 21 mph.
Tuesday Night
A slight chance of showers. Mostly clear, with a low around 47. Southwest wind 7 to 11 mph.
Wednesday
Sunny, with a high near 70. West wind 7 to 11 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Royalton IL
 37.9°N 89.11°W
Last Update:
8:47 pm CDT Oct 15, 2025
Forecast Valid:
9pm CDT Oct 15, 2025-6pm CDT Oct 22, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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