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Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fair

65°F

18°C

Humidity 97%
Wind Speed Calm
Barometer 29.91 in (1012.6 mb)
Dewpoint 64°F (18°C)
Visibility 9.00 mi
Last update 21 Jun 3:52 am CDT
Extended Forecast for

Jacob IL

  • Today

    Today: A 50 percent chance of showers and thunderstorms after 1pm. Increasing clouds, with a high near 89. Light and variable wind becoming south southwest 13 to 18 mph in the morning. Winds could gust as high as 26 mph.

    High: 89 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms, mainly before 2am, then showers likely and possibly a thunderstorm after 4am. Low around 68. South wind 6 to 15 mph becoming west after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 90%.

    Low: 68 °F

    T-storms then
    Showers
    Likely

  • Monday

    Monday: A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and noon. Mostly cloudy, with a high near 80. Northwest wind 7 to 10 mph. Chance of precipitation is 30%.

    High: 80 °F

    Chance
    Showers then
    Mostly Cloudy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 61. North wind 5 to 8 mph becoming calm in the evening.

    Low: 61 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 83. Light northeast wind.

    High: 83 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 63. Light north wind.

    Low: 63 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 85. Light and variable wind.

    High: 85 °F

    Sunny then
    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 65. Calm wind.

    Low: 65 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86. Calm wind becoming west northwest around 5 mph in the afternoon.

    High: 86 °F

    Mostly Sunny
    then Chance
    T-storms

Detailed Forecast

Today
A 50 percent chance of showers and thunderstorms after 1pm. Increasing clouds, with a high near 89. Light and variable wind becoming south southwest 13 to 18 mph in the morning. Winds could gust as high as 26 mph.
Tonight
Showers and thunderstorms, mainly before 2am, then showers likely and possibly a thunderstorm after 4am. Low around 68. South wind 6 to 15 mph becoming west after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 90%.
Monday
A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and noon. Mostly cloudy, with a high near 80. Northwest wind 7 to 10 mph. Chance of precipitation is 30%.
Monday Night
Partly cloudy, with a low around 61. North wind 5 to 8 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 83. Light northeast wind.
Tuesday Night
Mostly clear, with a low around 63. Light north wind.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 85. Light and variable wind.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 65. Calm wind.
Thursday
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86. Calm wind becoming west northwest around 5 mph in the afternoon.
Thursday Night
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 64. Light and variable wind.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Calm wind becoming south southwest around 5 mph in the afternoon.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. South wind around 5 mph becoming calm in the evening.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 89. Light south wind becoming south southwest 9 to 14 mph in the morning. Winds could gust as high as 21 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Jacob IL
 37.75°N 89.54°W
Last Update:
4:11 am CDT Jun 21, 2026
Forecast Valid:
4am CDT Jun 21, 2026-6pm CDT Jun 27, 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