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

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fair

63°F

17°C

Humidity 45%
Wind Speed SE 5 mph
Barometer 30.15 in (1020.9 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 8 Apr 8:52 pm CDT
Extended Forecast for

3 Miles NW Royalton IL

  • Tonight

    Tonight: Clear, with a low around 54. South wind 6 to 8 mph.

    Low: 54 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 77. South southwest wind 9 to 14 mph, with gusts as high as 21 mph.

    High: 77 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 56. South wind around 8 mph.

    Low: 56 °F

    Mostly Clear

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 78. South southwest wind 8 to 11 mph, with gusts as high as 18 mph.

    High: 78 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 55. North wind around 6 mph becoming light and variable in the evening. Chance of precipitation is 30%.

    Low: 55 °F

    Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80. Southeast wind around 6 mph.

    High: 80 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 60. East southeast wind around 6 mph.

    Low: 60 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 81. South wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 26 mph.

    High: 81 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 66. South wind 13 to 15 mph, with gusts as high as 26 mph.

    Low: 66 °F

    Mostly Cloudy
    then Chance
    T-storms

Detailed Forecast

Tonight
Clear, with a low around 54. South wind 6 to 8 mph.
Thursday
Sunny, with a high near 77. South southwest wind 9 to 14 mph, with gusts as high as 21 mph.
Thursday Night
Mostly clear, with a low around 56. South wind around 8 mph.
Friday
A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 78. South southwest wind 8 to 11 mph, with gusts as high as 18 mph.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 55. North wind around 6 mph becoming light and variable in the evening. Chance of precipitation is 30%.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80. Southeast wind around 6 mph.
Saturday Night
Partly cloudy, with a low around 60. East southeast wind around 6 mph.
Sunday
Mostly cloudy, with a high near 81. South wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 26 mph.
Sunday Night
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 66. South wind 13 to 15 mph, with gusts as high as 26 mph.
Monday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 81. Breezy, with a south southwest wind 16 to 21 mph, with gusts as high as 29 mph.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. South southwest wind around 15 mph, with gusts as high as 25 mph.
Tuesday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 81. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 28 mph.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 61. South southwest wind 11 to 14 mph, with gusts as high as 22 mph.
Wednesday
A chance of showers and thunderstorms. Partly sunny, with a high near 74. Southwest wind 11 to 14 mph, with gusts as high as 21 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NW Royalton IL
 37.92°N 89.16°W
Last Update:
7:52 pm CDT Apr 8, 2026
Forecast Valid:
9pm CDT Apr 8, 2026-6pm CDT Apr 15, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation