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 >

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

68°F

20°C

Humidity 72%
Wind Speed S 6 mph
Barometer 29.87 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 17 Oct 10:55 pm CDT
Extended Forecast for

Royalton IL

  • Tonight

    Tonight: Mostly clear, with a low around 63. South wind around 6 mph.

    Low: 63 °F

    Mostly Clear

  • Saturday

    Saturday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 3pm.  Increasing clouds, with a high near 81. South southwest wind 7 to 16 mph, with gusts as high as 24 mph.  Chance of precipitation is 70%.

    High: 81 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm before 1am, then showers likely. Some of the storms could produce heavy rainfall.  Low around 51. Southwest wind 10 to 16 mph, with gusts as high as 23 mph.  Chance of precipitation is 100%.

    Low: 51 °F

    Heavy Rain

  • Sunday

    Sunday: A 30 percent chance of showers, mainly before 7am.  Partly sunny, then gradually becoming sunny, with a high near 65. Breezy, with a west northwest wind 18 to 22 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 7 mph becoming calm  in the evening.

    Low: 41 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 72. Breezy, with a south wind 6 to 11 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 26 mph.

    High: 72 °F

    Sunny then
    Sunny and
    Breezy

  • Monday Night

    Monday Night: Mostly clear, with a low around 49. South southwest wind 9 to 16 mph becoming west after midnight. Winds could gust as high as 22 mph.

    Low: 49 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 66. West northwest wind 10 to 16 mph, with gusts as high as 23 mph.

    High: 66 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 39. West northwest wind 5 to 9 mph becoming light  after midnight.

    Low: 39 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 63. South wind around 6 mph.
Saturday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 3pm. Increasing clouds, with a high near 81. South southwest wind 7 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 70%.
Saturday Night
Showers and possibly a thunderstorm before 1am, then showers likely. Some of the storms could produce heavy rainfall. Low around 51. Southwest wind 10 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 100%.
Sunday
A 30 percent chance of showers, mainly before 7am. Partly sunny, then gradually becoming sunny, with a high near 65. Breezy, with a west northwest wind 18 to 22 mph, with gusts as high as 32 mph.
Sunday Night
Clear, with a low around 41. West wind 5 to 7 mph becoming calm in the evening.
Monday
Sunny, with a high near 72. Breezy, with a south wind 6 to 11 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 26 mph.
Monday Night
Mostly clear, with a low around 49. South southwest wind 9 to 16 mph becoming west after midnight. Winds could gust as high as 22 mph.
Tuesday
Sunny, with a high near 66. West northwest wind 10 to 16 mph, with gusts as high as 23 mph.
Tuesday Night
Mostly clear, with a low around 39. West northwest wind 5 to 9 mph becoming light after midnight.
Wednesday
Sunny, with a high near 66. West northwest wind 3 to 8 mph.
Wednesday Night
A slight chance of showers. Partly cloudy, with a low around 44. South wind 3 to 6 mph.
Thursday
A chance of showers. Partly sunny, with a high near 68. South southwest wind 6 to 11 mph.
Thursday Night
A chance of showers. Partly cloudy, with a low around 45. South southwest wind 3 to 7 mph.
Friday
A slight chance of showers. Mostly sunny, with a high near 67. North northwest wind 5 to 9 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Royalton IL
 37.87°N 89.11°W
7:45 pm CDT Oct 17, 2025
11pm CDT Oct 17, 2025-6pm CDT Oct 24, 2025
 
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Additional Resources

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Hourly Weather Forecast

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