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.

Fair

81°F

27°C

Humidity 39%
Wind Speed S 9 mph
Barometer 29.91 in
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 7 Oct 5:48 pm CDT
Extended Forecast for

Royalton IL

  • Tonight

    Tonight: Clear, with a low around 58. Southwest wind around 6 mph becoming calm in the evening.

    Low: 58 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 85. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 85 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 57. Calm wind.

    Low: 57 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 88. Calm wind becoming south southeast 5 to 8 mph in the morning.

    High: 88 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 61. Light south southeast wind.

    Low: 61 °F

    Mostly Clear

  • Saturday

    Saturday: A 30 percent chance of showers after 1pm. Partly sunny, with a high near 83. Light south southeast wind becoming southeast 6 to 11 mph in the morning.

    High: 83 °F

    Mostly Sunny
    then Chance
    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm before 1am, then showers likely. Low around 58. East wind 8 to 10 mph. Chance of precipitation is 80%.

    Low: 58 °F

    Showers

  • Sunday

    Sunday: Partly sunny, with a high near 76. East northeast wind 9 to 11 mph becoming northwest in the afternoon.

    High: 76 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 57. Light southwest wind.

    Low: 57 °F

    Partly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 58. Southwest wind around 6 mph becoming calm in the evening.
Thursday
Sunny, with a high near 85. Calm wind becoming northeast around 5 mph in the afternoon.
Thursday Night
Clear, with a low around 57. Calm wind.
Friday
Sunny, with a high near 88. Calm wind becoming south southeast 5 to 8 mph in the morning.
Friday Night
Mostly clear, with a low around 61. Light south southeast wind.
Saturday
A 30 percent chance of showers after 1pm. Partly sunny, with a high near 83. Light south southeast wind becoming southeast 6 to 11 mph in the morning.
Saturday Night
Showers and possibly a thunderstorm before 1am, then showers likely. Low around 58. East wind 8 to 10 mph. Chance of precipitation is 80%.
Sunday
Partly sunny, with a high near 76. East northeast wind 9 to 11 mph becoming northwest in the afternoon.
Sunday Night
Partly cloudy, with a low around 57. Light southwest wind.
Columbus Day
Mostly sunny, with a high near 86. Light southwest wind becoming south southwest 6 to 11 mph in the morning.
Monday Night
Mostly clear, with a low around 57. South southwest wind 6 to 9 mph.
Tuesday
Sunny, with a high near 75. West wind 8 to 15 mph becoming north northwest in the afternoon. Winds could gust as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 50. Northeast wind 6 to 10 mph.
Wednesday
A slight chance of showers. Sunny, with a high near 73. East wind 6 to 9 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Royalton IL
 37.9°N 89.11°W
Last Update:
1:50 pm CDT Oct 7, 2026
Forecast Valid:
6pm CDT Oct 7, 2026-6pm CDT Oct 14, 2026
 
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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