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.

Fair

75°F

24°C

Humidity 76%
Wind Speed N 3 mph
Barometer 30.00 in
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 15 Jun 7:55 pm CDT
Extended Forecast for

Royalton IL

  • Tonight

    Tonight: A slight chance of showers between 2am and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 69. Light east northeast wind. Chance of precipitation is 30%.

    Low: 69 °F

    Mostly Cloudy
    then Chance
    Showers

  • Monday

    Monday: A chance of showers and thunderstorms before 11am, then showers likely and possibly a thunderstorm between 11am and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 80. South wind 3 to 5 mph. Chance of precipitation is 60%.

    High: 80 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 69. Light and variable wind.

    Low: 69 °F

    Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, then gradually becoming sunny, with a high near 89. Calm wind becoming southwest 5 to 7 mph in the morning.

    High: 89 °F

    Decreasing
    Clouds

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 73. South wind 6 to 8 mph.

    Low: 73 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89. South southwest wind 10 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.

    High: 89 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 72. South southwest wind 7 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.

    Low: 72 °F

    Showers
    Likely

  • Juneteenth

    Juneteenth: A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86. West northwest wind around 8 mph.

    High: 86 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 67. Light and variable wind.

    Low: 67 °F

    Mostly Clear

Detailed Forecast

Tonight
A slight chance of showers between 2am and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 69. Light east northeast wind. Chance of precipitation is 30%.
Monday
A chance of showers and thunderstorms before 11am, then showers likely and possibly a thunderstorm between 11am and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 80. South wind 3 to 5 mph. Chance of precipitation is 60%.
Monday Night
A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 69. Light and variable wind.
Tuesday
Mostly cloudy, then gradually becoming sunny, with a high near 89. Calm wind becoming southwest 5 to 7 mph in the morning.
Tuesday Night
Partly cloudy, with a low around 73. South wind 6 to 8 mph.
Wednesday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89. South southwest wind 10 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.
Wednesday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 72. South southwest wind 7 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.
Juneteenth
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86. West northwest wind around 8 mph.
Thursday Night
Mostly clear, with a low around 67. Light and variable wind.
Friday
Sunny, with a high near 88. Calm wind becoming south 5 to 7 mph in the morning.
Friday Night
Mostly clear, with a low around 72. South wind around 6 mph.
Saturday
Sunny, with a high near 93. South southwest wind 6 to 11 mph, with gusts as high as 18 mph.
Saturday Night
Mostly clear, with a low around 75. South southwest wind 6 to 9 mph.
Sunday
Sunny, with a high near 92. South southwest wind 6 to 10 mph.
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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:
5:46 pm CDT Jun 15, 2025
Forecast Valid:
8pm CDT Jun 15, 2025-6pm CDT Jun 22, 2025
 
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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