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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

3 Miles S Jacob IL

Heat Advisory September 9, 11:00am until September 9, 08:00pm
Click here for hazard details and duration
Heat Advisory

  • Tonight

    Tonight: Mostly clear, with a steady temperature around 77. Calm wind becoming south 5 to 7 mph after midnight.

    Low: 77 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly after 3pm. Sunny and hot, with a high near 98. Heat index values as high as 107. South wind 7 to 11 mph becoming west northwest in the afternoon.

    High: 98 °F

    Sunny then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 2am. Low around 71. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.

    Low: 71 °F

    Chance
    T-storms then
    Showers

  • Thursday

    Thursday: Showers and possibly a thunderstorm before 10am, then showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. High near 85. Calm wind becoming north northwest around 6 mph in the afternoon. Chance of precipitation is 90%.

    High: 85 °F

    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 65. Light north northeast wind.

    Low: 65 °F

    Slight Chance
    Showers

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. Calm wind.

    High: 87 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: Mostly clear, with a low around 67. Calm wind.

    Low: 67 °F

    Mostly Clear

  • Saturday

    Saturday: A slight chance of showers after 1pm. Sunny, with a high near 92. Calm wind becoming south southwest around 6 mph in the morning.

    High: 92 °F

    Sunny then
    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: A slight chance of showers. Partly cloudy, with a low around 68. Calm wind.

    Low: 68 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a steady temperature around 77. Calm wind becoming south 5 to 7 mph after midnight.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly after 3pm. Sunny and hot, with a high near 98. Heat index values as high as 107. South wind 7 to 11 mph becoming west northwest in the afternoon.
Wednesday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 2am. Low around 71. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.
Thursday
Showers and possibly a thunderstorm before 10am, then showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. High near 85. Calm wind becoming north northwest around 6 mph in the afternoon. Chance of precipitation is 90%.
Thursday Night
A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 65. Light north northeast wind.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. Calm wind.
Friday Night
Mostly clear, with a low around 67. Calm wind.
Saturday
A slight chance of showers after 1pm. Sunny, with a high near 92. Calm wind becoming south southwest around 6 mph in the morning.
Saturday Night
A slight chance of showers. Partly cloudy, with a low around 68. Calm wind.
Sunday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 91. Calm wind becoming west southwest 5 to 7 mph in the morning.
Sunday Night
A slight chance of showers. Partly cloudy, with a low around 68. North northeast wind around 5 mph becoming light and variable in the evening.
Monday
Sunny, with a high near 91. South southwest wind 5 to 9 mph.
Monday Night
A slight chance of showers. Mostly clear, with a low around 68. South wind around 6 mph.
Tuesday
A chance of showers and thunderstorms. Sunny, with a high near 90. South southwest wind 5 to 8 mph becoming west northwest in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles S Jacob IL
 37.71°N 89.54°W
Last Update:
11:06 pm CDT Sep 8, 2026
Forecast Valid:
11pm CDT Sep 8, 2026-6pm CDT Sep 15, 2026
 
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