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

88°F

31°C

Humidity 59%
Wind Speed S 6 mph
Barometer 30.05 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index95°F (35°C)
Last update 20 Jun 2:47 pm CDT
Extended Forecast for

Royalton IL

Heat Advisory June 21, 12:00pm until June 24, 07:00pm
Click here for hazard details and duration
Heat Advisory

  • This Afternoon

    This Afternoon: Sunny, with a high near 90. South wind around 9 mph.

    High: 90 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 75. South wind around 8 mph.

    Low: 75 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 95. Heat index values as high as 106. South southwest wind 9 to 14 mph, with gusts as high as 21 mph.

    High: 95 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 76. South wind 7 to 11 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 96. South southwest wind 6 to 10 mph.

    High: 96 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 75. South wind 5 to 8 mph.

    Low: 75 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 94. South southwest wind 5 to 7 mph.

    High: 94 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 75. South wind around 6 mph becoming calm in the evening.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93. Calm wind becoming south around 6 mph in the afternoon.

    High: 93 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 90. South wind around 9 mph.
Tonight
Mostly clear, with a low around 75. South wind around 8 mph.
Saturday
Sunny, with a high near 95. Heat index values as high as 106. South southwest wind 9 to 14 mph, with gusts as high as 21 mph.
Saturday Night
Clear, with a low around 76. South wind 7 to 11 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 96. South southwest wind 6 to 10 mph.
Sunday Night
Clear, with a low around 75. South wind 5 to 8 mph.
Monday
Sunny, with a high near 94. South southwest wind 5 to 7 mph.
Monday Night
Mostly clear, with a low around 75. South wind around 6 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 93. Calm wind becoming south around 6 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 74. South wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 93. Calm wind becoming south southwest around 6 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 75. South wind around 6 mph becoming calm in the evening.
Thursday
A slight chance of showers and thunderstorms. Sunny, with a high near 93. South southwest wind 3 to 8 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Royalton IL
 37.9°N 89.11°W
Last Update:
1:46 pm CDT Jun 20, 2025
Forecast Valid:
3pm CDT Jun 20, 2025-6pm CDT Jun 26, 2025
 
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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