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.

Fair

64°F

18°C

Humidity 73%
Wind Speed S 6 mph
Barometer 30.00 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 12 Oct 2:35 am CDT
Extended Forecast for

Royalton IL

  • Overnight

    Overnight: Patchy fog before 4am. Otherwise, partly cloudy, with a low around 61. South southwest wind around 6 mph.

    Low: 61 °F

    Patchy Fog

  • Columbus Day

    Columbus Day: Sunny, with a high near 91. Southwest wind 5 to 14 mph, with gusts as high as 20 mph.

    High: 91 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 66. Southwest wind around 8 mph.

    Low: 66 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93. Southwest wind 7 to 11 mph.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Mostly clear, with a low around 71. South southwest wind around 6 mph. Chance of precipitation is 30%.

    Low: 71 °F

    Clear then
    Chance
    Showers

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 86. Southwest wind 5 to 7 mph. Chance of precipitation is 90%.

    High: 86 °F

    Showers
    Likely then
    Showers

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 10pm, then showers likely between 10pm and 1am, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Calm wind. Chance of precipitation is 70%.

    Low: 66 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 84. Light and variable wind becoming west southwest 8 to 13 mph in the morning.

    High: 84 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 55. West northwest wind 6 to 15 mph, with gusts as high as 18 mph.

    Low: 55 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Overnight
Patchy fog before 4am. Otherwise, partly cloudy, with a low around 61. South southwest wind around 6 mph.
Columbus Day
Sunny, with a high near 91. Southwest wind 5 to 14 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 66. Southwest wind around 8 mph.
Tuesday
Sunny, with a high near 93. Southwest wind 7 to 11 mph.
Tuesday Night
A chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Mostly clear, with a low around 71. South southwest wind around 6 mph. Chance of precipitation is 30%.
Wednesday
Showers and possibly a thunderstorm. High near 86. Southwest wind 5 to 7 mph. Chance of precipitation is 90%.
Wednesday Night
Showers likely and possibly a thunderstorm before 10pm, then showers likely between 10pm and 1am, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Calm wind. Chance of precipitation is 70%.
Thursday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 84. Light and variable wind becoming west southwest 8 to 13 mph in the morning.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 55. West northwest wind 6 to 15 mph, with gusts as high as 18 mph.
Friday
Mostly sunny, with a high near 66. Breezy, with a north northwest wind 18 to 22 mph, with gusts as high as 29 mph.
Friday Night
Mostly clear, with a low around 39. North wind 9 to 18 mph, with gusts as high as 25 mph.
Saturday
Sunny, with a high near 62. Northeast wind 7 to 9 mph.
Saturday Night
Clear, with a low around 36. Calm wind.
Sunday
Sunny, with a high near 70. Calm wind becoming south 5 to 7 mph in the morning.
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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:
1:26 am CDT Oct 12, 2026
Forecast Valid:
2am CDT Oct 12, 2026-6pm CDT Oct 18, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation