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.

Overcast

80°F

27°C

Humidity 80%
Wind Speed SW 8 mph
Barometer 29.66 in
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 18 Jun 2:55 am CDT
Extended Forecast for

Royalton IL

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms before 4am. Mostly cloudy, with a steady temperature around 75. West southwest wind around 8 mph.

    Low: 75 °F

    Chance
    Showers

  • Thursday

    Thursday: Mostly sunny, with a high near 85. West southwest wind 5 to 8 mph becoming north northwest in the afternoon.

    High: 85 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 62. North northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 62 °F

    Partly Cloudy

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 84. Light north wind.

    High: 84 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 64. Calm wind.

    Low: 64 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 86. Calm wind becoming south around 5 mph in the afternoon.

    High: 86 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68. Light south southeast wind.

    Low: 68 °F

    Mostly Clear
    then Chance
    T-storms

  • Sunday

    Sunday: Showers and possibly a thunderstorm. Partly sunny, with a high near 85. South southwest wind 5 to 14 mph, with gusts as high as 21 mph.

    High: 85 °F

    Showers

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm before 1am, then showers likely. Mostly cloudy, with a low around 66. West southwest wind around 14 mph becoming northwest after midnight. Winds could gust as high as 18 mph.

    Low: 66 °F

    Showers

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms before 4am. Mostly cloudy, with a steady temperature around 75. West southwest wind around 8 mph.
Thursday
Mostly sunny, with a high near 85. West southwest wind 5 to 8 mph becoming north northwest in the afternoon.
Thursday Night
Partly cloudy, with a low around 62. North northwest wind 5 to 7 mph becoming calm in the evening.
Juneteenth
Mostly sunny, with a high near 84. Light north wind.
Friday Night
Partly cloudy, with a low around 64. Calm wind.
Saturday
Mostly sunny, with a high near 86. Calm wind becoming south around 5 mph in the afternoon.
Saturday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68. Light south southeast wind.
Sunday
Showers and possibly a thunderstorm. Partly sunny, with a high near 85. South southwest wind 5 to 14 mph, with gusts as high as 21 mph.
Sunday Night
Showers and possibly a thunderstorm before 1am, then showers likely. Mostly cloudy, with a low around 66. West southwest wind around 14 mph becoming northwest after midnight. Winds could gust as high as 18 mph.
Monday
A chance of showers, mainly before 1pm. Mostly cloudy, with a high near 80. North wind 10 to 13 mph, with gusts as high as 18 mph.
Monday Night
Partly cloudy, with a low around 60. North wind 5 to 10 mph becoming light north northeast in the evening.
Tuesday
Mostly sunny, with a high near 82. North northeast wind 3 to 5 mph.
Tuesday Night
Partly cloudy, with a low around 62. Light north northeast wind.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 84. Light and variable wind.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Royalton IL
 37.9°N 89.11°W
Last Update:
2:01 am CDT Jun 18, 2026
Forecast Valid:
3am CDT Jun 18, 2026-6pm CDT Jun 24, 2026
 
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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