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

Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Overcast

71°F

22°C

Humidity 85%
Wind Speed S 17 G 25 mph
Barometer 29.81 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 11 Mar 12:15 am CDT
Extended Forecast for

Royalton IL

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms, mainly after 4am. Mostly cloudy, with a steady temperature around 71. South southwest wind around 17 mph, with gusts as high as 30 mph.

    Low: 71 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Showers and thunderstorms before 4pm, then a chance of showers. Temperature rising to near 70 by noon, then falling to around 55 during the remainder of the day. Breezy, with a southwest wind 13 to 22 mph becoming north northwest in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 90%.

    High: 70 °F⇓

    Showers and
    Breezy

  • Wednesday Night

    Wednesday Night: A 10 percent chance of showers before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 33. North northwest wind 9 to 18 mph, with gusts as high as 30 mph.

    Low: 33 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 55. Northwest wind 5 to 8 mph becoming southwest in the afternoon.

    High: 55 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 42. South wind 7 to 17 mph, with gusts as high as 28 mph.

    Low: 42 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 64. Southwest wind 13 to 16 mph, with gusts as high as 25 mph.

    High: 64 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 39. North northwest wind around 6 mph becoming east after midnight.

    Low: 39 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 69. East wind 6 to 13 mph becoming south in the afternoon. Winds could gust as high as 20 mph.

    High: 69 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 54. South wind 10 to 14 mph, with gusts as high as 24 mph.

    Low: 54 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms, mainly after 4am. Mostly cloudy, with a steady temperature around 71. South southwest wind around 17 mph, with gusts as high as 30 mph.
Wednesday
Showers and thunderstorms before 4pm, then a chance of showers. Temperature rising to near 70 by noon, then falling to around 55 during the remainder of the day. Breezy, with a southwest wind 13 to 22 mph becoming north northwest in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 90%.
Wednesday Night
A 10 percent chance of showers before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 33. North northwest wind 9 to 18 mph, with gusts as high as 30 mph.
Thursday
Sunny, with a high near 55. Northwest wind 5 to 8 mph becoming southwest in the afternoon.
Thursday Night
Partly cloudy, with a low around 42. South wind 7 to 17 mph, with gusts as high as 28 mph.
Friday
Partly sunny, with a high near 64. Southwest wind 13 to 16 mph, with gusts as high as 25 mph.
Friday Night
Partly cloudy, with a low around 39. North northwest wind around 6 mph becoming east after midnight.
Saturday
Sunny, with a high near 69. East wind 6 to 13 mph becoming south in the afternoon. Winds could gust as high as 20 mph.
Saturday Night
Partly cloudy, with a low around 54. South wind 10 to 14 mph, with gusts as high as 24 mph.
Sunday
A chance of showers and thunderstorms, then showers likely after 1pm. Partly sunny, with a high near 69. Breezy, with a south wind 16 to 22 mph becoming west in the afternoon. Winds could gust as high as 32 mph.
Sunday Night
A chance of rain and snow showers. Mostly cloudy, with a low around 24. Blustery, with a northwest wind 16 to 20 mph, with gusts as high as 29 mph.
Monday
Mostly sunny, with a high near 39. Northwest wind around 15 mph, with gusts as high as 23 mph.
Monday Night
Partly cloudy, with a low around 20. North northwest wind 5 to 9 mph.
Tuesday
Mostly sunny, with a high near 45. North wind 5 to 9 mph becoming south southwest in the afternoon.
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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:
11:21 pm CDT Mar 10, 2026
Forecast Valid:
12am CDT Mar 11, 2026-6pm CDT Mar 17, 2026
 
Forecast Discussion
 
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Additional Resources

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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