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

  • Tonight

    Tonight: A slight chance of drizzle after 4am. Cloudy, with a low around 34. Light south wind.

    Low: 34 °F

    Cloudy then
    Slight Chance
    Drizzle

  • Sunday

    Sunday: A slight chance of drizzle before 5pm. Cloudy, with a high near 45. Light and variable wind becoming north northwest 8 to 13 mph in the morning.

    High: 45 °F

    Slight Chance
    Drizzle

  • Sunday Night

    Sunday Night: A slight chance of rain and snow showers before 10pm, then a slight chance of snow showers between 10pm and midnight. Cloudy, with a low around 25. North wind 7 to 13 mph. Chance of precipitation is 20%.

    Low: 25 °F

    Slight Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 37. North wind 5 to 7 mph becoming calm in the afternoon.

    High: 37 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Partly cloudy, with a low around 25. Calm wind becoming south southwest 5 to 9 mph after midnight.

    Low: 25 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 49. South southwest wind 10 to 16 mph, with gusts as high as 23 mph.

    High: 49 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 41. South southwest wind around 16 mph, with gusts as high as 24 mph.

    Low: 41 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers after noon. Partly sunny, with a high near 52. Southwest wind 9 to 16 mph becoming northwest in the afternoon. Winds could gust as high as 23 mph.

    High: 52 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A slight chance of rain showers before midnight, then a chance of rain and snow showers. Mostly cloudy, with a low around 29. Northwest wind 5 to 7 mph becoming east after midnight.

    Low: 29 °F

    Slight Chance
    Showers then
    Chance
    Rain/Snow

Detailed Forecast

Tonight
A slight chance of drizzle after 4am. Cloudy, with a low around 34. Light south wind.
Sunday
A slight chance of drizzle before 5pm. Cloudy, with a high near 45. Light and variable wind becoming north northwest 8 to 13 mph in the morning.
Sunday Night
A slight chance of rain and snow showers before 10pm, then a slight chance of snow showers between 10pm and midnight. Cloudy, with a low around 25. North wind 7 to 13 mph. Chance of precipitation is 20%.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 37. North wind 5 to 7 mph becoming calm in the afternoon.
Monday Night
Partly cloudy, with a low around 25. Calm wind becoming south southwest 5 to 9 mph after midnight.
Tuesday
Mostly sunny, with a high near 49. South southwest wind 10 to 16 mph, with gusts as high as 23 mph.
Tuesday Night
Mostly cloudy, with a low around 41. South southwest wind around 16 mph, with gusts as high as 24 mph.
Wednesday
A slight chance of showers after noon. Partly sunny, with a high near 52. Southwest wind 9 to 16 mph becoming northwest in the afternoon. Winds could gust as high as 23 mph.
Wednesday Night
A slight chance of rain showers before midnight, then a chance of rain and snow showers. Mostly cloudy, with a low around 29. Northwest wind 5 to 7 mph becoming east after midnight.
Thursday
A chance of rain and snow showers before noon, then a slight chance of rain showers. Mostly cloudy, with a high near 40. East wind 6 to 10 mph becoming west in the afternoon.
Thursday Night
Mostly cloudy, with a low around 22. West northwest wind 6 to 9 mph.
Friday
Partly sunny, with a high near 31. Northwest wind 9 to 11 mph.
Friday Night
Partly cloudy, with a low around 11. Northwest wind 7 to 9 mph.
Saturday
Mostly sunny, with a high near 28. Northwest wind 7 to 10 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Royalton IL
 37.87°N 89.11°W
Last Update:
5:11 pm CST Dec 6, 2025
Forecast Valid:
9pm CST Dec 6, 2025-6pm CST Dec 13, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation