National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

A Few Clouds

82°F

28°C

Humidity 74%
Wind Speed SW 17 G 24 mph
Barometer 29.60 in (1001.9 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 17 Jun 11:52 pm CDT
Extended Forecast for

3 Miles NW Royalton IL

  • Tonight

    Tonight: Showers and thunderstorms, mainly before 3am. Low around 72. West southwest wind 7 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.

    Low: 72 °F

    T-storms

  • Thursday

    Thursday: Mostly sunny, with a high near 86. Light and variable wind becoming northwest 5 to 8 mph in the morning.

    High: 86 °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 85. Light north wind.

    High: 85 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Clear

  • 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 40 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 67. South wind around 6 mph becoming calm in the evening.

    Low: 67 °F

    Chance
    T-storms

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 86. South southeast wind 6 to 11 mph becoming southwest 12 to 17 mph in the afternoon. Winds could gust as high as 24 mph.

    High: 86 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm before 1am, then showers likely. Mostly cloudy, with a low around 68. West southwest wind 11 to 16 mph, with gusts as high as 21 mph.

    Low: 68 °F

    Showers

Detailed Forecast

Tonight
Showers and thunderstorms, mainly before 3am. Low around 72. West southwest wind 7 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.
Thursday
Mostly sunny, with a high near 86. Light and variable wind becoming northwest 5 to 8 mph in the morning.
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 85. Light north wind.
Friday Night
Mostly clear, 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 40 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 67. South wind around 6 mph becoming calm in the evening.
Sunday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 86. South southeast wind 6 to 11 mph becoming southwest 12 to 17 mph in the afternoon. Winds could gust as high as 24 mph.
Sunday Night
Showers and possibly a thunderstorm before 1am, then showers likely. Mostly cloudy, with a low around 68. West southwest wind 11 to 16 mph, with gusts as high as 21 mph.
Monday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. West wind 9 to 11 mph becoming north in the afternoon. Winds could gust as high as 18 mph.
Monday Night
Partly cloudy, with a low around 63. North wind 5 to 10 mph becoming light after midnight.
Tuesday
Mostly sunny, with a high near 82. East northeast wind 3 to 6 mph.
Tuesday Night
Partly cloudy, with a low around 63. Calm wind.
Wednesday
Mostly sunny, with a high near 85. Light northwest wind.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NW Royalton IL
 37.9°N 89.16°W
Last Update:
10:56 pm CDT Jun 17, 2026
Forecast Valid:
11pm CDT Jun 17, 2026-6pm CDT Jun 24, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation