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

68°F

20°C

Humidity 89%
Wind Speed S 3 mph
Barometer 30.01 in
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 25 Jun 1:55 am CDT
Extended Forecast for

Royalton IL

Flood Watch June 25, 04:00pm until June 27, 07:00am
Click here for hazard details and duration
Flood Watch

  • Overnight

    Overnight: Partly cloudy, with a low around 68. Calm wind.

    Low: 68 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers and thunderstorms before 3pm, then a slight chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 88. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 20%.

    High: 88 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 3am. Increasing clouds, with a low around 70. Light southeast wind. Chance of precipitation is 70%.

    Low: 70 °F

    Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: Showers and thunderstorms likely before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 84. South wind 6 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.

    High: 84 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 7pm. Mostly cloudy, with a low around 71. South southwest wind 5 to 9 mph becoming light southwest after midnight. Chance of precipitation is 70%.

    Low: 71 °F

    Showers
    Likely

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 89. Southwest wind 3 to 8 mph. Chance of precipitation is 60%.

    High: 89 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 73. South wind 3 to 5 mph.

    Low: 73 °F

    Chance
    T-storms

  • Sunday

    Sunday: Sunny, with a high near 95. South southwest wind 6 to 10 mph.

    High: 95 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 75. South wind 5 to 9 mph.

    Low: 75 °F

    Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 68. Calm wind.
Thursday
A slight chance of showers and thunderstorms before 3pm, then a slight chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 88. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 20%.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 3am. Increasing clouds, with a low around 70. Light southeast wind. Chance of precipitation is 70%.
Friday
Showers and thunderstorms likely before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 84. South wind 6 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.
Friday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 7pm. Mostly cloudy, with a low around 71. South southwest wind 5 to 9 mph becoming light southwest after midnight. Chance of precipitation is 70%.
Saturday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 89. Southwest wind 3 to 8 mph. Chance of precipitation is 60%.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 73. South wind 3 to 5 mph.
Sunday
Sunny, with a high near 95. South southwest wind 6 to 10 mph.
Sunday Night
Clear, with a low around 75. South wind 5 to 9 mph.
Monday
Sunny, with a high near 96. Light south southwest wind increasing to 5 to 10 mph in the morning.
Monday Night
Clear, with a low around 77. South wind 5 to 8 mph becoming calm after midnight.
Tuesday
Sunny and hot, with a high near 98. Calm wind becoming south southwest around 6 mph in the morning.
Tuesday Night
Clear, with a low around 77. South wind around 6 mph becoming calm in the evening.
Wednesday
Sunny and hot, with a high near 98. Light south 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:
1:26 am CDT Jun 25, 2026
Forecast Valid:
2am CDT Jun 25, 2026-6pm CDT Jul 1, 2026
 
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