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

Tracking Storm System Across the Eastern U.S.

A storm system will continue to produce widespread showers and thunderstorms as it progresses eastward across the central U.S. into the Northeast through the weekend. There are risks of severe thunderstorms and excessive rainfall on Saturday from the Ozarks into the mid-Mississippi River Valley with potential for damaging winds, large hail, tornadoes, and flash flooding. Read More >

Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Light Rain

63°F

17°C

Humidity 96%
Wind Speed Calm
Barometer 29.68 in
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 18 Oct 9:55 pm CDT
Extended Forecast for

Royalton IL

  • Tonight

    Tonight: Showers and possibly a thunderstorm before 5am, then showers likely. Low around 51. South wind 13 to 16 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 80%.

    Low: 51 °F

    Showers

  • Sunday

    Sunday: A 30 percent chance of showers, mainly before 8am. Cloudy through mid morning, then gradual clearing, with a high near 65. Breezy, with a west northwest wind 20 to 24 mph, with gusts as high as 32 mph.

    High: 65 °F

    Breezy.
    Chance
    Showers then
    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 41. West wind 5 to 10 mph becoming light west southwest in the evening.

    Low: 41 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 70. Breezy, with a south wind 5 to 10 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 70 °F

    Sunny then
    Sunny and
    Breezy

  • Monday Night

    Monday Night: Mostly clear, with a low around 51. South wind 10 to 16 mph becoming west southwest after midnight. Winds could gust as high as 22 mph.

    Low: 51 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 68. Breezy, with a west wind 10 to 20 mph, with gusts as high as 25 mph.

    High: 68 °F

    Sunny then
    Sunny and
    Breezy

  • Tuesday Night

    Tuesday Night: Clear, with a low around 42. West wind 6 to 11 mph.

    Low: 42 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 64. West northwest wind 7 to 13 mph.

    High: 64 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 39. West wind around 5 mph becoming calm in the evening.

    Low: 39 °F

    Mostly Clear

Detailed Forecast

Tonight
Showers and possibly a thunderstorm before 5am, then showers likely. Low around 51. South wind 13 to 16 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 80%.
Sunday
A 30 percent chance of showers, mainly before 8am. Cloudy through mid morning, then gradual clearing, with a high near 65. Breezy, with a west northwest wind 20 to 24 mph, with gusts as high as 32 mph.
Sunday Night
Clear, with a low around 41. West wind 5 to 10 mph becoming light west southwest in the evening.
Monday
Sunny, with a high near 70. Breezy, with a south wind 5 to 10 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 25 mph.
Monday Night
Mostly clear, with a low around 51. South wind 10 to 16 mph becoming west southwest after midnight. Winds could gust as high as 22 mph.
Tuesday
Sunny, with a high near 68. Breezy, with a west wind 10 to 20 mph, with gusts as high as 25 mph.
Tuesday Night
Clear, with a low around 42. West wind 6 to 11 mph.
Wednesday
Sunny, with a high near 64. West northwest wind 7 to 13 mph.
Wednesday Night
Mostly clear, with a low around 39. West wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 69. Calm wind becoming south southwest 5 to 8 mph in the morning.
Thursday Night
A slight chance of showers. Partly cloudy, with a low around 46. South southeast wind 3 to 5 mph.
Friday
A chance of showers. Partly sunny, with a high near 66. South southeast wind 6 to 10 mph.
Friday Night
A chance of showers. Mostly cloudy, with a low around 50. Southeast wind 5 to 8 mph.
Saturday
A slight chance of showers. Partly sunny, with a high near 65. South southeast wind 6 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:
7:45 pm CDT Oct 18, 2025
Forecast Valid:
10pm CDT Oct 18, 2025-6pm CDT Oct 25, 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