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

67°F

19°C

Humidity 71%
Wind Speed Calm
Barometer 30.10 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 4 Oct 7:55 pm CDT
Extended Forecast for

Royalton IL

  • Tonight

    Tonight: Clear, with a low around 57. Light south southeast wind.

    Low: 57 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 86. South wind 5 to 11 mph.

    High: 86 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 64. Southeast wind around 6 mph.

    Low: 64 °F

    Mostly Clear

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82. South wind 5 to 9 mph.

    High: 82 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers before 10pm, then a chance of showers and thunderstorms between 10pm and 1am, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Southeast wind around 6 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 66 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 78. Calm wind becoming north northwest 5 to 9 mph in the morning. Chance of precipitation is 70%.

    High: 78 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 57. North wind around 8 mph. Chance of precipitation is 20%.

    Low: 57 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: Mostly sunny, with a high near 75. Northeast wind 9 to 11 mph.

    High: 75 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 51. East northeast wind 5 to 7 mph.

    Low: 51 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 57. Light south southeast wind.
Sunday
Sunny, with a high near 86. South wind 5 to 11 mph.
Sunday Night
Mostly clear, with a low around 64. Southeast wind around 6 mph.
Monday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82. South wind 5 to 9 mph.
Monday Night
A chance of showers before 10pm, then a chance of showers and thunderstorms between 10pm and 1am, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Southeast wind around 6 mph becoming calm in the evening. Chance of precipitation is 60%.
Tuesday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 78. Calm wind becoming north northwest 5 to 9 mph in the morning. Chance of precipitation is 70%.
Tuesday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 57. North wind around 8 mph. Chance of precipitation is 20%.
Wednesday
Mostly sunny, with a high near 75. Northeast wind 9 to 11 mph.
Wednesday Night
Mostly clear, with a low around 51. East northeast wind 5 to 7 mph.
Thursday
Sunny, with a high near 76. East wind around 7 mph.
Thursday Night
Mostly clear, with a low around 52. East wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 79. Calm wind becoming south southwest 5 to 8 mph in the morning.
Friday Night
Mostly clear, with a low around 54. South wind around 6 mph becoming light and variable.
Saturday
Sunny, with a high near 76. North northeast wind 5 to 9 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Royalton IL
 37.9°N 89.11°W
Last Update:
6:01 pm CDT Oct 4, 2025
Forecast Valid:
8pm CDT Oct 4, 2025-6pm CDT Oct 11, 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