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

76°F

24°C

Humidity 89%
Wind Speed SW 6 mph
Barometer 29.97 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index76°F (24°C)
Last update 26 Aug 10:55 pm CDT
Extended Forecast for

Royalton IL

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before midnight. Partly cloudy, with a low around 67. Calm wind.

    Low: 67 °F

    Chance
    Showers

  • Thursday

    Thursday: Sunny, with a high near 89. Calm wind becoming north 5 to 9 mph in the morning.

    High: 89 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 64. North wind around 5 mph becoming calm in the evening.

    Low: 64 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 88. Calm wind becoming north 5 to 7 mph in the afternoon.

    High: 88 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 60. Light east wind.

    Low: 60 °F

    Mostly Clear

  • Saturday

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

    High: 91 °F

    Sunny

  • Saturday Night

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

    Low: 64 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 94. Light south wind becoming south southwest 6 to 11 mph in the morning.

    High: 94 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 70. South wind 3 to 6 mph.

    Low: 70 °F

    Mostly Clear

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms, mainly before midnight. Partly cloudy, with a low around 67. Calm wind.
Thursday
Sunny, with a high near 89. Calm wind becoming north 5 to 9 mph in the morning.
Thursday Night
Mostly clear, with a low around 64. North wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 88. Calm wind becoming north 5 to 7 mph in the afternoon.
Friday Night
Mostly clear, with a low around 60. Light east wind.
Saturday
Sunny, with a high near 91. Light and variable wind.
Saturday Night
Mostly clear, with a low around 64. Calm wind.
Sunday
Sunny, with a high near 94. Light south wind becoming south southwest 6 to 11 mph in the morning.
Sunday Night
Mostly clear, with a low around 70. South wind 3 to 6 mph.
Monday
Sunny, with a high near 96. South southwest wind 5 to 13 mph.
Monday Night
Mostly clear, with a low around 73. South wind 5 to 8 mph.
Tuesday
Sunny and hot, with a high near 97. Southwest wind 5 to 9 mph.
Tuesday Night
Mostly clear, with a low around 74. South southwest wind 3 to 6 mph.
Wednesday
Sunny and hot, with a high near 97. Light south southwest wind becoming southwest 5 to 9 mph in the morning.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Royalton IL
 37.87°N 89.11°W
Last Update:
9:16 pm CDT Aug 26, 2026
Forecast Valid:
11pm CDT Aug 26, 2026-6pm CDT Sep 2, 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