National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Mostly Cloudy

71°F

22°C

Humidity 72%
Wind Speed Calm
Barometer 30.03 in
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 19 Jun 8:55 pm CDT
Extended Forecast for

Royalton IL

  • Tonight

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

    Low: 64 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 87. Light west southwest wind.

    High: 87 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 10 percent chance of showers after 5am. Increasing clouds, with a low around 68. Light and variable wind.

    Low: 68 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. High near 86. South wind 5 to 10 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 80%.

    High: 86 °F

    Showers

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm. Low around 70. South southwest wind 11 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 100%.

    Low: 70 °F

    Showers

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 81. Northwest wind 10 to 13 mph, with gusts as high as 18 mph.

    High: 81 °F

    Chance
    T-storms then
    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63. North wind 5 to 10 mph becoming light in the evening.

    Low: 63 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 82. North northeast wind 3 to 5 mph.

    High: 82 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 63. Light north northeast wind.

    Low: 63 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 64. Calm wind.
Saturday
Mostly sunny, with a high near 87. Light west southwest wind.
Saturday Night
A 10 percent chance of showers after 5am. Increasing clouds, with a low around 68. Light and variable wind.
Sunday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. High near 86. South wind 5 to 10 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 80%.
Sunday Night
Showers and possibly a thunderstorm. Low around 70. South southwest wind 11 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 100%.
Monday
A 40 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 81. Northwest wind 10 to 13 mph, with gusts as high as 18 mph.
Monday Night
Partly cloudy, with a low around 63. North wind 5 to 10 mph becoming light in the evening.
Tuesday
Mostly sunny, with a high near 82. North northeast wind 3 to 5 mph.
Tuesday Night
Partly cloudy, with a low around 63. Light north northeast wind.
Wednesday
Mostly sunny, with a high near 84. Calm wind becoming west around 5 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 63. West northwest wind around 5 mph becoming calm in the evening.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 83. Calm wind becoming west 5 to 7 mph in the morning.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 64. West northwest wind around 6 mph becoming calm in the evening.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 84. Calm wind becoming south southeast around 6 mph in the morning.
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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:
8:46 pm CDT Jun 19, 2026
Forecast Valid:
9pm CDT Jun 19, 2026-6pm CDT Jun 26, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation