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Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Overcast

82°F

28°C

Humidity 70%
Wind Speed SW 15 mph
Barometer 30.10 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 9 Sep 8:52 am CDT
Extended Forecast for

Jacob IL

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

  • Today

    Today: A chance of showers, with thunderstorms also possible after noon. Mostly sunny and hot, with a high near 97. Heat index values as high as 110. Southwest wind 6 to 10 mph. Chance of precipitation is 40%.

    High: 97 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 71. West southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%.

    Low: 71 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm before 11am, then a chance of showers between 11am and 1pm, then a chance of showers and thunderstorms after 1pm. High near 86. Calm wind becoming northwest around 6 mph in the afternoon. Chance of precipitation is 80%.

    High: 86 °F

    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 66. Light north northeast wind. Chance of precipitation is 30%.

    Low: 66 °F

    Chance
    Showers

  • Friday

    Friday: A 30 percent chance of showers after 1pm. Partly sunny, with a high near 87. Calm wind.

    High: 87 °F

    Partly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 67. Calm wind.

    Low: 67 °F

    Partly Cloudy

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92. Calm wind becoming south southwest around 5 mph.

    High: 92 °F

    Mostly Sunny
    then Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 68. Calm wind.

    Low: 68 °F

    Chance
    Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 92. Calm wind becoming south southwest 5 to 7 mph in the afternoon.

    High: 92 °F

    Mostly Sunny

Detailed Forecast

Today
A chance of showers, with thunderstorms also possible after noon. Mostly sunny and hot, with a high near 97. Heat index values as high as 110. Southwest wind 6 to 10 mph. Chance of precipitation is 40%.
Tonight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 71. West southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%.
Thursday
Showers and possibly a thunderstorm before 11am, then a chance of showers between 11am and 1pm, then a chance of showers and thunderstorms after 1pm. High near 86. Calm wind becoming northwest around 6 mph in the afternoon. Chance of precipitation is 80%.
Thursday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 66. Light north northeast wind. Chance of precipitation is 30%.
Friday
A 30 percent chance of showers after 1pm. Partly sunny, with a high near 87. Calm wind.
Friday Night
Partly cloudy, with a low around 67. Calm wind.
Saturday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92. Calm wind becoming south southwest around 5 mph.
Saturday Night
A chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 68. Calm wind.
Sunday
Mostly sunny, with a high near 92. Calm wind becoming south southwest 5 to 7 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 69. South wind 3 to 5 mph.
Monday
Sunny, with a high near 94. South southwest wind 5 to 11 mph.
Monday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 70. South wind 5 to 7 mph.
Tuesday
A chance of showers and thunderstorms. Sunny, with a high near 91. Southwest wind 5 to 8 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Jacob IL
 37.75°N 89.54°W
Last Update:
9:06 am CDT Sep 9, 2026
Forecast Valid:
9am CDT Sep 9, 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