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

77°F

25°C

Humidity 32%
Wind Speed SE 7 mph
Barometer 30.05 in
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 6 Oct 1:52 pm CDT
Extended Forecast for

2 Miles WNW Royalton IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 78. Light south wind.

    High: 78 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 51. Calm wind.

    Low: 51 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 87. Calm wind becoming west southwest 5 to 8 mph in the morning.

    High: 87 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 57. Southwest wind around 5 mph becoming calm in the evening.

    Low: 57 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 85. Calm wind becoming north northeast 5 to 7 mph in the morning.

    High: 85 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 53. Light northeast wind.

    Low: 53 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 84. Light and variable wind becoming southeast 5 to 8 mph in the morning.

    High: 84 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 57. Light southeast wind.

    Low: 57 °F

    Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 86. Light south southeast wind becoming south 6 to 11 mph in the morning.

    High: 86 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 78. Light south wind.
Tonight
Clear, with a low around 51. Calm wind.
Wednesday
Sunny, with a high near 87. Calm wind becoming west southwest 5 to 8 mph in the morning.
Wednesday Night
Mostly clear, with a low around 57. Southwest wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 85. Calm wind becoming north northeast 5 to 7 mph in the morning.
Thursday Night
Clear, with a low around 53. Light northeast wind.
Friday
Sunny, with a high near 84. Light and variable wind becoming southeast 5 to 8 mph in the morning.
Friday Night
Clear, with a low around 57. Light southeast wind.
Saturday
Mostly sunny, with a high near 86. Light south southeast wind becoming south 6 to 11 mph in the morning.
Saturday Night
A chance of showers, with thunderstorms also possible after 1am. Partly cloudy, with a low around 58. Southeast wind 5 to 7 mph.
Sunday
A chance of showers. Partly sunny, with a high near 77. East wind 6 to 10 mph.
Sunday Night
Partly cloudy, with a low around 56. North wind around 5 mph becoming calm in the evening.
Columbus Day
Mostly sunny, with a high near 82. Calm wind becoming north northwest 5 to 8 mph in the morning.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WNW Royalton IL
 37.9°N 89.14°W
Last Update:
1:16 pm CDT Oct 6, 2026
Forecast Valid:
2pm CDT Oct 6, 2026-6pm CDT Oct 12, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation