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

69°F

21°C

Humidity 98%
Wind Speed NW 5 mph
Barometer 29.73 in
Dewpoint 68°F (20°C)
Visibility 7.00 mi
Last update 2 Aug 5:35 am CDT
Extended Forecast for

Royalton IL

  • Today

    Today: A 20 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 81. North northwest wind 14 to 16 mph, with gusts as high as 23 mph.

    High: 81 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: Mostly clear, with a low around 65. North wind 6 to 11 mph becoming light after midnight.

    Low: 65 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 85. North northeast wind 3 to 7 mph.

    High: 85 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Clear, with a low around 64. Light northeast wind.

    Low: 64 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 88. Light north northeast wind.

    High: 88 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 65. Calm wind.

    Low: 65 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 91. Light and variable wind.

    High: 91 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 69. Calm wind.

    Low: 69 °F

    Mostly Clear

  • Thursday

    Thursday: A slight chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 90. Calm wind becoming southwest 5 to 8 mph in the morning.

    High: 90 °F

    Slight Chance
    T-storms

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 81. North northwest wind 14 to 16 mph, with gusts as high as 23 mph.
Tonight
Mostly clear, with a low around 65. North wind 6 to 11 mph becoming light after midnight.
Monday
Mostly sunny, with a high near 85. North northeast wind 3 to 7 mph.
Monday Night
Clear, with a low around 64. Light northeast wind.
Tuesday
Sunny, with a high near 88. Light north northeast wind.
Tuesday Night
Mostly clear, with a low around 65. Calm wind.
Wednesday
Sunny, with a high near 91. Light and variable wind.
Wednesday Night
Mostly clear, with a low around 69. Calm wind.
Thursday
A slight chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 90. Calm wind becoming southwest 5 to 8 mph in the morning.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 71. South wind around 6 mph becoming calm in the evening.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 90. Southwest wind 3 to 7 mph.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 71. South wind around 5 mph becoming calm in the evening.
Saturday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 92. Calm wind becoming south southwest 5 to 7 mph in the morning.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Royalton IL
 37.9°N 89.11°W
Last Update:
3:46 am CDT Aug 2, 2026
Forecast Valid:
5am CDT Aug 2, 2026-6pm CDT Aug 8, 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