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.

Partly Cloudy

74°F

23°C

Humidity 72%
Wind Speed Calm
Barometer 30.03 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 3 Aug 7:55 pm CDT
Extended Forecast for

Royalton IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 65. Calm wind.

    Low: 65 °F

    Mostly Cloudy

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 82. Light northeast wind increasing to 5 to 9 mph in the afternoon.

    High: 82 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 67. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 67 °F

    Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 85. Calm wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 40%.

    High: 85 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 67. Light east southeast wind.

    Low: 67 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 88. Light east southeast wind.

    High: 88 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 68. Light east southeast wind.

    Low: 68 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 90. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 90 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 69. East southeast wind around 5 mph becoming calm in the evening.

    Low: 69 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 65. Calm wind.
Monday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 82. Light northeast wind increasing to 5 to 9 mph in the afternoon.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 67. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Tuesday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 85. Calm wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 40%.
Tuesday Night
Mostly clear, with a low around 67. Light east southeast wind.
Wednesday
Mostly sunny, with a high near 88. Light east southeast wind.
Wednesday Night
Mostly clear, with a low around 68. Light east southeast wind.
Thursday
Sunny, with a high near 90. Calm wind becoming east southeast around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 69. East southeast wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 91. Calm wind becoming south southeast 5 to 7 mph in the morning.
Friday Night
Mostly clear, with a low around 70. Southeast wind 3 to 6 mph.
Saturday
Sunny, with a high near 93. South wind 3 to 8 mph.
Saturday Night
Mostly clear, with a low around 72. South southeast wind 3 to 6 mph.
Sunday
Sunny, with a high near 94. South wind 3 to 7 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Royalton IL
 37.87°N 89.11°W
Last Update:
7:30 pm CDT Aug 3, 2025
Forecast Valid:
8pm CDT Aug 3, 2025-6pm CDT Aug 10, 2025
 
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