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

72°F

22°C

Humidity 94%
Wind Speed Calm
Barometer 30.05 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 4 Aug 7:47 am CDT
Extended Forecast for

Royalton IL

  • Today

    Today: Sunny, with a high near 88. Light and variable wind.

    High: 88 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 91. Calm wind.

    High: 91 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 69. Calm wind.

    Low: 69 °F

    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 90. Calm wind becoming south southwest 5 to 7 mph in the morning.

    High: 90 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 71. Light south wind. Chance of precipitation is 60%.

    Low: 71 °F

    Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 89. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 89 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Calm wind.

    Low: 70 °F

    Chance
    T-storms

  • Saturday

    Saturday: A slight chance of showers and thunderstorms. Partly sunny, with a high near 90. Calm wind becoming south southwest around 5 mph in the morning.

    High: 90 °F

    Slight Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 88. Light and variable wind.
Tonight
Mostly clear, with a low around 64. Calm wind.
Wednesday
Sunny, with a high near 91. Calm wind.
Wednesday Night
Partly cloudy, with a low around 69. Calm wind.
Thursday
A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 90. Calm wind becoming south southwest 5 to 7 mph in the morning.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 71. Light south wind. Chance of precipitation is 60%.
Friday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 89. Calm wind becoming southwest around 6 mph in the afternoon.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Calm wind.
Saturday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 90. Calm wind becoming south southwest around 5 mph in the morning.
Saturday Night
Partly cloudy, with a low around 71. Light south wind.
Sunday
Mostly sunny, with a high near 92. Light south southwest wind increasing to 5 to 9 mph in the morning.
Sunday Night
Mostly clear, with a low around 72. South wind 5 to 9 mph becoming light south southwest.
Monday
Sunny, with a high near 94. South southwest wind 5 to 10 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:
6:41 am CDT Aug 4, 2026
Forecast Valid:
8am CDT Aug 4, 2026-6pm CDT Aug 10, 2026
 
Forecast Discussion
 
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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