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

34°F

1°C

Humidity 93%
Wind Speed N 5 mph
Barometer 29.92 in
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 1 Jan 7:15 pm CST
Extended Forecast for

Royalton IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 30. Calm wind.

    Low: 30 °F

    Mostly Cloudy

  • Friday

    Friday: Cloudy, with a high near 41. Northeast wind 3 to 7 mph.

    High: 41 °F

    Cloudy

  • Friday Night

    Friday Night: Cloudy, with a low around 30. Northeast wind around 6 mph.

    Low: 30 °F

    Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 42. North northeast wind 5 to 7 mph.

    High: 42 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 25. Light north northwest wind.

    Low: 25 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 43. Light and variable wind.

    High: 43 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 32. Calm wind becoming south 5 to 7 mph after midnight.

    Low: 32 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 56. South southwest wind 8 to 13 mph, with gusts as high as 20 mph.

    High: 56 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 45. South wind 7 to 9 mph.

    Low: 45 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 30. Calm wind.
Friday
Cloudy, with a high near 41. Northeast wind 3 to 7 mph.
Friday Night
Cloudy, with a low around 30. Northeast wind around 6 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 42. North northeast wind 5 to 7 mph.
Saturday Night
Mostly clear, with a low around 25. Light north northwest wind.
Sunday
Mostly sunny, with a high near 43. Light and variable wind.
Sunday Night
Partly cloudy, with a low around 32. Calm wind becoming south 5 to 7 mph after midnight.
Monday
Mostly sunny, with a high near 56. South southwest wind 8 to 13 mph, with gusts as high as 20 mph.
Monday Night
Partly cloudy, with a low around 45. South wind 7 to 9 mph.
Tuesday
Partly sunny, with a high near 62. Southwest wind 8 to 13 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly cloudy, with a low around 41. South southwest wind 5 to 7 mph becoming light and variable after midnight.
Wednesday
Partly sunny, with a high near 59. Light and variable wind becoming west southwest 5 to 7 mph in the morning.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 44. Calm wind becoming south southeast around 6 mph after midnight.
Thursday
A chance of showers. Mostly cloudy, with a high near 60. South southeast wind 6 to 9 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Royalton IL
 37.87°N 89.11°W
Last Update:
5:06 pm CST Jan 1, 2026
Forecast Valid:
7pm CST Jan 1, 2026-6pm CST Jan 8, 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