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

72°F

22°C

Humidity 41%
Wind Speed NE 3 mph
Barometer 30.08 in
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 26 Sep 4:45 pm CDT
Extended Forecast for

Royalton IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 58. Calm wind.

    Low: 58 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 76. Calm wind becoming north northeast around 5 mph in the afternoon.

    High: 76 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 52. Calm wind.

    Low: 52 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 77. Light northeast wind.

    High: 77 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 54. Calm wind.

    Low: 54 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 82. Calm wind becoming south around 5 mph in the afternoon.

    High: 82 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 64. Calm wind becoming south southeast around 5 mph after midnight.

    Low: 64 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 84. South southwest wind 5 to 11 mph.

    High: 84 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers, mainly after 1am. Mostly cloudy, with a low around 68. Southeast wind 5 to 7 mph.

    Low: 68 °F

    Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a low around 58. Calm wind.
Sunday
Mostly sunny, with a high near 76. Calm wind becoming north northeast around 5 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 52. Calm wind.
Monday
Sunny, with a high near 77. Light northeast wind.
Monday Night
Mostly clear, with a low around 54. Calm wind.
Tuesday
Sunny, with a high near 82. Calm wind becoming south around 5 mph in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 64. Calm wind becoming south southeast around 5 mph after midnight.
Wednesday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 84. South southwest wind 5 to 11 mph.
Wednesday Night
A chance of showers, mainly after 1am. Mostly cloudy, with a low around 68. Southeast wind 5 to 7 mph.
Thursday
A chance of showers. Mostly cloudy, with a high near 80. South southwest wind 9 to 15 mph, with gusts as high as 20 mph.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 65. South wind 5 to 7 mph.
Friday
A chance of showers. Mostly cloudy, with a high near 75. South wind 7 to 10 mph.
Friday Night
A chance of showers. Mostly cloudy, with a low around 62. North northeast wind around 5 mph becoming calm in the evening.
Saturday
A chance of showers. Partly sunny, with a high near 74. East northeast wind 5 to 9 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Royalton IL
 37.87°N 89.11°W
Last Update:
2:31 pm CDT Sep 26, 2026
Forecast Valid:
5pm CDT Sep 26, 2026-6pm CDT Oct 3, 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