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.

Partly Cloudy

79°F

26°C

Humidity 74%
Wind Speed W 8 mph
Barometer 30.02 in (1016.2 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 27 Jun 7:52 pm CDT
Extended Forecast for

Alto Pass IL

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 4am. Patchy fog after midnight. Otherwise, partly cloudy, with a low around 72. Light south southwest wind.

    Low: 72 °F

    Chance
    T-storms and
    Patchy Fog

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms, mainly after 8am. Partly sunny, with a high near 87. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 87 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Light south southwest wind. Chance of precipitation is 30%.

    Low: 73 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Sunday

    Sunday: A chance of showers before 7am, then a chance of showers and thunderstorms between 7am and 1pm, then showers and possibly a thunderstorm after 1pm. High near 85. Calm wind becoming south southwest around 6 mph in the afternoon. Chance of precipitation is 80%.

    High: 85 °F

    Chance
    Showers then
    Showers

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 72. South southwest wind 3 to 5 mph.

    Low: 72 °F

    Chance
    T-storms

  • Monday

    Monday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 88. West southwest wind around 6 mph. Chance of precipitation is 80%.

    High: 88 °F

    Chance
    T-storms then
    T-storms

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 71. West wind around 5 mph becoming calm in the evening.

    Low: 71 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: Mostly sunny, with a high near 85. North wind around 6 mph.

    High: 85 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 67. Light north wind.

    Low: 67 °F

    Partly Cloudy

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms, mainly after 4am. Patchy fog after midnight. Otherwise, partly cloudy, with a low around 72. Light south southwest wind.
Saturday
A 50 percent chance of showers and thunderstorms, mainly after 8am. Partly sunny, with a high near 87. Calm wind becoming southwest around 5 mph in the afternoon.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Light south southwest wind. Chance of precipitation is 30%.
Sunday
A chance of showers before 7am, then a chance of showers and thunderstorms between 7am and 1pm, then showers and possibly a thunderstorm after 1pm. High near 85. Calm wind becoming south southwest around 6 mph in the afternoon. Chance of precipitation is 80%.
Sunday Night
A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 72. South southwest wind 3 to 5 mph.
Monday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 88. West southwest wind around 6 mph. Chance of precipitation is 80%.
Monday Night
A 50 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 71. West wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 85. North wind around 6 mph.
Tuesday Night
Partly cloudy, with a low around 67. Light north wind.
Wednesday
Mostly sunny, with a high near 87. Calm wind.
Wednesday Night
Mostly clear, with a low around 69. Calm wind.
Thursday
Sunny, with a high near 89. Calm wind becoming south southwest around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 71. South wind around 5 mph becoming calm in the evening.
Independence Day
A chance of showers and thunderstorms. Mostly sunny, with a high near 89. South southwest wind 3 to 7 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Alto Pass IL
 37.57°N 89.32°W
Last Update:
8:33 pm CDT Jun 27, 2025
Forecast Valid:
8pm CDT Jun 27, 2025-6pm CDT Jul 4, 2025
 
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