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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Royalton IL

  • Today

    Today: Mostly sunny, with a high near 76. Southwest wind 11 to 18 mph, with gusts as high as 24 mph.

    High: 76 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 45. West southwest wind 7 to 9 mph becoming north after midnight.

    Low: 45 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 60. North wind 5 to 9 mph becoming light north northwest in the afternoon.

    High: 60 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 36. Calm wind.

    Low: 36 °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 71. South southeast wind 9 to 13 mph becoming north northwest in the afternoon. Winds could gust as high as 18 mph.

    High: 71 °F

    Chance
    Showers then
    Partly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers. Partly cloudy, with a low around 47. North northeast wind 5 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. East northeast wind 5 to 8 mph becoming southeast in the morning.

    High: 64 °F

    Chance
    Showers

Detailed Forecast

Today
Mostly sunny, with a high near 76. Southwest wind 11 to 18 mph, with gusts as high as 24 mph.
Tonight
Mostly clear, with a low around 45. West southwest wind 7 to 9 mph becoming north after midnight.
Sunday
Sunny, with a high near 60. North wind 5 to 9 mph becoming light north northwest in the afternoon.
Sunday Night
Mostly clear, with a low around 36. 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 71. 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 northeast wind 5 to 8 mph.
Wednesday
A chance of showers, mainly after noon. Partly sunny, with a high near 64. East northeast wind 5 to 8 mph becoming southeast in the morning.
Wednesday Night
Showers likely, mainly after midnight. Mostly cloudy, with a low around 52. Southeast wind 5 to 7 mph.
Thursday
Showers and possibly a thunderstorm. Mostly cloudy, with a high near 66. 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.
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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:
3:16 am CST Nov 15, 2025
Forecast Valid:
5am CST Nov 15, 2025-6pm CST Nov 21, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation