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

81°F

27°C

Humidity 58%
Wind Speed SW 9 mph
Barometer 30.02 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 21 Sep 12:45 pm CDT
Extended Forecast for

Royalton IL

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 86. South southwest wind 8 to 11 mph.

    High: 86 °F

    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 66. South southwest wind around 6 mph becoming light and variable. Chance of precipitation is 70%.

    Low: 66 °F

    Chance
    T-storms then
    Showers
    Likely

  • Monday

    Monday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 85. South wind 6 to 11 mph. Chance of precipitation is 70%.

    High: 85 °F

    Showers
    Likely

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm before 4am, then showers likely. Low around 65. South wind 3 to 6 mph. Chance of precipitation is 80%.

    Low: 65 °F

    Showers

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 81. South southwest wind 3 to 7 mph. Chance of precipitation is 50%.

    High: 81 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Light south southwest wind. Chance of precipitation is 70%.

    Low: 66 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 77. East southeast wind 5 to 10 mph. Chance of precipitation is 70%.

    High: 77 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. North northeast wind 5 to 7 mph.

    Low: 62 °F

    Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms. Partly sunny, with a high near 76. North wind 6 to 11 mph.

    High: 76 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 86. South southwest wind 8 to 11 mph.
Tonight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 66. South southwest wind around 6 mph becoming light and variable. Chance of precipitation is 70%.
Monday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 85. South wind 6 to 11 mph. Chance of precipitation is 70%.
Monday Night
Showers and possibly a thunderstorm before 4am, then showers likely. Low around 65. South wind 3 to 6 mph. Chance of precipitation is 80%.
Tuesday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 81. South southwest wind 3 to 7 mph. Chance of precipitation is 50%.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Light south southwest wind. Chance of precipitation is 70%.
Wednesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 77. East southeast wind 5 to 10 mph. Chance of precipitation is 70%.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. North northeast wind 5 to 7 mph.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 76. North wind 6 to 11 mph.
Thursday Night
A chance of showers. Partly cloudy, with a low around 58. North northwest wind 3 to 7 mph.
Friday
A chance of showers. Mostly sunny, with a high near 77. North northwest wind 5 to 9 mph.
Friday Night
A slight chance of showers. Partly cloudy, with a low around 58. North northwest wind around 6 mph becoming calm in the evening.
Saturday
A slight chance of showers. Mostly sunny, with a high near 79. North wind 3 to 8 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Royalton IL
 37.87°N 89.11°W
Last Update:
12:46 pm CDT Sep 21, 2025
Forecast Valid:
1pm CDT Sep 21, 2025-6pm CDT Sep 27, 2025
 
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