National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Partly Cloudy

52°F

11°C

Humidity 28%
Wind Speed S 7 mph
Barometer 30.14 in
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill50°F (10°C)
Last update 12 Mar 5:45 pm CDT
Extended Forecast for

Royalton IL

  • Tonight

    Tonight: Partly cloudy, with a low around 43. Breezy, with a south wind 5 to 10 mph increasing to 16 to 21 mph after midnight. Winds could gust as high as 33 mph.

    Low: 43 °F

    Partly Cloudy
    then Partly
    Cloudy and
    Breezy

  • Friday

    Friday: Mostly sunny, with a high near 63. Southwest wind 13 to 18 mph, with gusts as high as 33 mph.

    High: 63 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 37. West northwest wind around 6 mph becoming calm in the evening.

    Low: 37 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 66. East wind 6 to 11 mph becoming south southeast in the afternoon.

    High: 66 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 54. Southeast wind 8 to 13 mph, with gusts as high as 23 mph.

    Low: 54 °F

    Partly Cloudy

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 71. Breezy, with a south wind 16 to 25 mph, with gusts as high as 37 mph. Chance of precipitation is 70%.

    High: 71 °F

    Breezy.
    Mostly Cloudy
    then Showers
    Likely

  • Sunday Night

    Sunday Night: Rain showers before 1am, then a chance of rain and snow showers. Some thunder is also possible. Low around 25. Breezy, with a south southwest wind around 25 mph becoming west northwest after midnight. Winds could gust as high as 36 mph. Chance of precipitation is 80%.

    Low: 25 °F

    Showers and
    Breezy then
    Rain/Snow and
    Blustery

  • Monday

    Monday: Partly sunny, with a high near 33. Breezy, with a west northwest wind 22 to 24 mph, with gusts as high as 33 mph.

    High: 33 °F

    Partly Sunny
    and Breezy

  • Monday Night

    Monday Night: Mostly clear, with a low around 14. Northwest wind 8 to 17 mph, with gusts as high as 23 mph.

    Low: 14 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 43. Breezy, with a south wind 5 to 10 mph increasing to 16 to 21 mph after midnight. Winds could gust as high as 33 mph.
Friday
Mostly sunny, with a high near 63. Southwest wind 13 to 18 mph, with gusts as high as 33 mph.
Friday Night
Partly cloudy, with a low around 37. West northwest wind around 6 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 66. East wind 6 to 11 mph becoming south southeast in the afternoon.
Saturday Night
Partly cloudy, with a low around 54. Southeast wind 8 to 13 mph, with gusts as high as 23 mph.
Sunday
Showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 71. Breezy, with a south wind 16 to 25 mph, with gusts as high as 37 mph. Chance of precipitation is 70%.
Sunday Night
Rain showers before 1am, then a chance of rain and snow showers. Some thunder is also possible. Low around 25. Breezy, with a south southwest wind around 25 mph becoming west northwest after midnight. Winds could gust as high as 36 mph. Chance of precipitation is 80%.
Monday
Partly sunny, with a high near 33. Breezy, with a west northwest wind 22 to 24 mph, with gusts as high as 33 mph.
Monday Night
Mostly clear, with a low around 14. Northwest wind 8 to 17 mph, with gusts as high as 23 mph.
Tuesday
Mostly sunny, with a high near 37. West wind 7 to 9 mph.
Tuesday Night
A slight chance of rain and snow showers. Mostly cloudy, with a low around 27. South southeast wind 7 to 9 mph.
Wednesday
Partly sunny, with a high near 55. South southwest wind 10 to 13 mph, with gusts as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around 39. South southwest wind around 7 mph.
Thursday
Mostly sunny, with a high near 66. South southwest wind 6 to 10 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Royalton IL
 37.9°N 89.11°W
Last Update:
5:51 pm CDT Mar 12, 2026
Forecast Valid:
6pm CDT Mar 12, 2026-6pm CDT Mar 19, 2026
 
Forecast Discussion
 
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Additional Resources

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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