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.

A Few Clouds

75°F

24°C

Humidity 61%
Wind Speed SW 17 G 26 mph
Barometer 29.72 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 15 Nov 11:45 am CST
Extended Forecast for

Royalton IL

  • Today

    Today: Sunny, with a high near 77. Southwest wind 9 to 16 mph, with gusts as high as 28 mph.

    High: 77 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 45. Southwest wind 6 to 8 mph becoming north northwest after midnight.

    Low: 45 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 60. North northwest wind 6 to 10 mph.

    High: 60 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 35. Calm wind.

    Low: 35 °F

    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers after noon. Mostly sunny, with a high near 60. Calm wind becoming east southeast 5 to 9 mph in the morning.

    High: 60 °F

    Sunny then
    Slight Chance
    Showers

  • Monday Night

    Monday Night: Showers before 9pm, then showers and possibly a thunderstorm between 9pm and 3am, then showers after 3am. Low around 47. Southeast wind 7 to 10 mph. Chance of precipitation is 80%.

    Low: 47 °F

    Showers

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms before noon. Partly sunny, with a high near 72. South southeast wind 9 to 13 mph becoming north northwest in the afternoon. Winds could gust as high as 18 mph.

    High: 72 °F

    Chance
    Showers then
    Partly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers. Partly cloudy, with a low around 47. North wind 3 to 8 mph.

    Low: 47 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, mainly after noon. Partly sunny, with a high near 64. Northeast wind 5 to 7 mph becoming southeast in the morning.

    High: 64 °F

    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 77. Southwest wind 9 to 16 mph, with gusts as high as 28 mph.
Tonight
Partly cloudy, with a low around 45. Southwest wind 6 to 8 mph becoming north northwest after midnight.
Sunday
Sunny, with a high near 60. North northwest wind 6 to 10 mph.
Sunday Night
Mostly clear, with a low around 35. Calm wind.
Monday
A 20 percent chance of showers after noon. Mostly sunny, with a high near 60. Calm wind becoming east southeast 5 to 9 mph in the morning.
Monday Night
Showers before 9pm, then showers and possibly a thunderstorm between 9pm and 3am, then showers after 3am. Low around 47. Southeast wind 7 to 10 mph. Chance of precipitation is 80%.
Tuesday
A 30 percent chance of showers and thunderstorms before noon. Partly sunny, with a high near 72. South southeast wind 9 to 13 mph becoming north northwest in the afternoon. Winds could gust as high as 18 mph.
Tuesday Night
A slight chance of showers. Partly cloudy, with a low around 47. North wind 3 to 8 mph.
Wednesday
A chance of showers, mainly after noon. Partly sunny, with a high near 64. Northeast wind 5 to 7 mph becoming southeast in the morning.
Wednesday Night
Showers likely, mainly after midnight. Mostly cloudy, with a low around 52. Southeast wind 3 to 7 mph.
Thursday
Showers and possibly a thunderstorm. Mostly cloudy, with a high near 67. South southeast wind 7 to 11 mph, with gusts as high as 18 mph.
Thursday Night
Showers likely. Mostly cloudy, with a low around 54. South southeast wind 8 to 10 mph.
Friday
A chance of showers. Mostly cloudy, with a high near 67. South southwest wind 10 to 14 mph, with gusts as high as 20 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:
10:31 am CST Nov 15, 2025
Forecast Valid:
11am CST Nov 15, 2025-6pm CST Nov 21, 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