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

27°F

-3°C

Humidity 68%
Wind Speed Calm
Barometer 30.53 in
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Last update 11 Jan 7:35 pm CST
Extended Forecast for

Royalton IL

  • Tonight

    Tonight: Clear, with a low around 24. Calm wind becoming south southwest 5 to 7 mph after midnight.

    Low: 24 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 50. Southwest wind 8 to 11 mph, with gusts as high as 18 mph.

    High: 50 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 35. South southwest wind 6 to 9 mph.

    Low: 35 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 58. Southwest wind 10 to 15 mph, with gusts as high as 22 mph.

    High: 58 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 41. Southwest wind 7 to 10 mph becoming west northwest after midnight.

    Low: 41 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers. Mostly cloudy, with a high near 45. Breezy, with a northwest wind 9 to 14 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 45 °F

    Slight Chance
    Showers and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 19. Blustery, with a north northwest wind 14 to 20 mph, with gusts as high as 29 mph.

    Low: 19 °F

    Mostly Cloudy
    and Blustery
    then Mostly
    Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 34. North northwest wind 6 to 14 mph, with gusts as high as 22 mph.

    High: 34 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 26. Southwest wind 5 to 9 mph.

    Low: 26 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 24. Calm wind becoming south southwest 5 to 7 mph after midnight.
Monday
Sunny, with a high near 50. Southwest wind 8 to 11 mph, with gusts as high as 18 mph.
Monday Night
Mostly clear, with a low around 35. South southwest wind 6 to 9 mph.
Tuesday
Mostly sunny, with a high near 58. Southwest wind 10 to 15 mph, with gusts as high as 22 mph.
Tuesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 41. Southwest wind 7 to 10 mph becoming west northwest after midnight.
Wednesday
A 20 percent chance of showers. Mostly cloudy, with a high near 45. Breezy, with a northwest wind 9 to 14 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.
Wednesday Night
Mostly cloudy, with a low around 19. Blustery, with a north northwest wind 14 to 20 mph, with gusts as high as 29 mph.
Thursday
Mostly sunny, with a high near 34. North northwest wind 6 to 14 mph, with gusts as high as 22 mph.
Thursday Night
Mostly cloudy, with a low around 26. Southwest wind 5 to 9 mph.
Friday
Partly sunny, with a high near 44. South southwest wind 9 to 14 mph, with gusts as high as 20 mph.
Friday Night
Mostly cloudy, with a low around 25. West wind 6 to 9 mph.
Saturday
Mostly cloudy, with a high near 35. West northwest wind 9 to 14 mph, with gusts as high as 20 mph.
Saturday Night
Partly cloudy, with a low around 18. West northwest wind 6 to 8 mph.
Sunday
Mostly sunny, with a high near 32. West wind 8 to 13 mph, with gusts as high as 18 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Royalton IL
 37.9°N 89.11°W
Last Update:
6:12 pm CST Jan 11, 2026
Forecast Valid:
8pm CST Jan 11, 2026-6pm CST Jan 18, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation