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

70°F

21°C

Humidity 86%
Wind Speed S 5 mph
Barometer 30.00 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 24 Jun 10:55 pm CDT
Extended Forecast for

Royalton IL

  • Tonight

    Tonight: A chance of showers between 1am and 5am, then a chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 68. Light south wind. Chance of precipitation is 30%.

    Low: 68 °F

    Chance
    Showers

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 87. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 87 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely, mainly before midnight, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 70. Light south wind. Chance of precipitation is 60%.

    Low: 70 °F

    Showers
    Likely

  • Friday

    Friday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 86. South southwest wind 5 to 11 mph. Chance of precipitation is 70%.

    High: 86 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm. Partly cloudy, with a low around 71. South southwest wind 3 to 7 mph. Chance of precipitation is 60%.

    Low: 71 °F

    Showers
    Likely

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 89. Southwest wind 5 to 8 mph. Chance of precipitation is 60%.

    High: 89 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73. South wind around 6 mph.

    Low: 73 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: Sunny, with a high near 95. South southwest wind 7 to 13 mph, with gusts as high as 18 mph.

    High: 95 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 74. South southwest wind 5 to 11 mph.

    Low: 74 °F

    Clear

Detailed Forecast

Tonight
A chance of showers between 1am and 5am, then a chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 68. Light south wind. Chance of precipitation is 30%.
Thursday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 87. Calm wind becoming southwest around 6 mph in the afternoon.
Thursday Night
Showers and thunderstorms likely, mainly before midnight, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 70. Light south wind. Chance of precipitation is 60%.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 86. South southwest wind 5 to 11 mph. Chance of precipitation is 70%.
Friday Night
Showers likely and possibly a thunderstorm. Partly cloudy, with a low around 71. South southwest wind 3 to 7 mph. Chance of precipitation is 60%.
Saturday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 89. Southwest wind 5 to 8 mph. Chance of precipitation is 60%.
Saturday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73. South wind around 6 mph.
Sunday
Sunny, with a high near 95. South southwest wind 7 to 13 mph, with gusts as high as 18 mph.
Sunday Night
Clear, with a low around 74. South southwest wind 5 to 11 mph.
Monday
Sunny and hot, with a high near 97. South southwest wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 75. South wind 5 to 9 mph becoming calm after midnight.
Tuesday
Sunny and hot, with a high near 99. Calm wind becoming south southwest around 6 mph in the morning.
Tuesday Night
Clear, with a low around 76. South wind 5 to 7 mph becoming calm in the evening.
Wednesday
Sunny and hot, with a high near 100. Light southwest wind.
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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:
9:51 pm CDT Jun 24, 2026
Forecast Valid:
11pm CDT Jun 24, 2026-6pm CDT Jul 1, 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