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

49°F

9°C

Humidity 67%
Wind Speed NW 3 mph
Barometer 30.17 in
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 4 Apr 9:15 pm CDT
Extended Forecast for

Royalton IL

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 40. Calm wind becoming northwest 5 to 8 mph in the evening.

    Low: 40 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 60. Northwest wind 7 to 13 mph, with gusts as high as 18 mph.

    High: 60 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 38. Northwest wind around 6 mph becoming calm in the evening.

    Low: 38 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 65. Light west wind becoming northwest 5 to 10 mph in the morning.

    High: 65 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 39. North northeast wind 6 to 8 mph.

    Low: 39 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 57. East northeast wind around 10 mph.

    High: 57 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 39. East southeast wind around 7 mph.

    Low: 39 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 73. South wind 6 to 11 mph, with gusts as high as 18 mph.

    High: 73 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 54. South wind 8 to 10 mph, with gusts as high as 18 mph.

    Low: 54 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming clear, with a low around 40. Calm wind becoming northwest 5 to 8 mph in the evening.
Sunday
Sunny, with a high near 60. Northwest wind 7 to 13 mph, with gusts as high as 18 mph.
Sunday Night
Mostly clear, with a low around 38. Northwest wind around 6 mph becoming calm in the evening.
Monday
Sunny, with a high near 65. Light west wind becoming northwest 5 to 10 mph in the morning.
Monday Night
Partly cloudy, with a low around 39. North northeast wind 6 to 8 mph.
Tuesday
Mostly sunny, with a high near 57. East northeast wind around 10 mph.
Tuesday Night
Partly cloudy, with a low around 39. East southeast wind around 7 mph.
Wednesday
Mostly sunny, with a high near 73. South wind 6 to 11 mph, with gusts as high as 18 mph.
Wednesday Night
Partly cloudy, with a low around 54. South wind 8 to 10 mph, with gusts as high as 18 mph.
Thursday
Mostly sunny, with a high near 73. South wind 10 to 14 mph, with gusts as high as 21 mph.
Thursday Night
Partly cloudy, with a low around 54. South wind around 8 mph.
Friday
Partly sunny, with a high near 77. South wind 8 to 13 mph, with gusts as high as 18 mph.
Friday Night
A slight chance of showers. Mostly cloudy, with a low around 57. South southeast wind around 8 mph.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 79. South wind 8 to 13 mph, with gusts as high as 18 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:
9:26 pm CDT Apr 4, 2026
Forecast Valid:
9pm CDT Apr 4, 2026-6pm CDT Apr 11, 2026
 
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