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

70°F

21°C

Humidity 94%
Wind Speed Calm
Barometer 30.02 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 20 Aug 11:55 pm CDT
Extended Forecast for

Royalton IL

  • Overnight

    Overnight: Mostly clear, with a low around 65. North northeast wind around 6 mph.

    Low: 65 °F

    Mostly Clear

  • Thursday

    Thursday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 86. North northeast wind 6 to 11 mph.

    High: 86 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 65. Northeast wind 5 to 8 mph becoming calm in the evening.

    Low: 65 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 89. Calm wind becoming northeast 5 to 7 mph in the morning.

    High: 89 °F

    Sunny

  • Friday Night

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

    Low: 64 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 92. Calm wind becoming northwest 5 to 7 mph in the afternoon.

    High: 92 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 64. North northwest wind 3 to 6 mph.

    Low: 64 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 85. North northwest wind 5 to 11 mph.

    High: 85 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 58. North northwest wind 5 to 9 mph becoming calm in the evening.

    Low: 58 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 65. North northeast wind around 6 mph.
Thursday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 86. North northeast wind 6 to 11 mph.
Thursday Night
Mostly clear, with a low around 65. Northeast wind 5 to 8 mph becoming calm in the evening.
Friday
Sunny, with a high near 89. Calm wind becoming northeast 5 to 7 mph in the morning.
Friday Night
Mostly clear, with a low around 64. Northeast wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 92. Calm wind becoming northwest 5 to 7 mph in the afternoon.
Saturday Night
Partly cloudy, with a low around 64. North northwest wind 3 to 6 mph.
Sunday
Sunny, with a high near 85. North northwest wind 5 to 11 mph.
Sunday Night
Mostly clear, with a low around 58. North northwest wind 5 to 9 mph becoming calm in the evening.
Monday
Sunny, with a high near 79. Light north northwest wind becoming northwest 5 to 10 mph in the morning.
Monday Night
Partly cloudy, with a low around 55. North northwest wind 5 to 7 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 79. Calm wind becoming north northwest around 6 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 55. North northwest wind around 6 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 81. Calm wind becoming north 5 to 7 mph in the morning.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Royalton IL
 37.9°N 89.11°W
Last Update:
11:31 pm CDT Aug 20, 2025
Forecast Valid:
12am CDT Aug 21, 2025-6pm CDT Aug 27, 2025
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

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Chance of Precipitation