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

46°F

8°C

Humidity 53%
Wind Speed W 3 mph
Barometer 29.78 in
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 25 Feb 8:49 am CST
Extended Forecast for

Jacob IL

  • Today

    Today: Mostly cloudy, with a high near 58. Calm wind becoming north northeast around 5 mph.

    High: 58 °F

    Mostly Cloudy

  • Tonight

    Tonight: A chance of showers between midnight and 5am. Mostly cloudy, with a low around 36. East northeast wind 3 to 6 mph. Chance of precipitation is 40%.

    Low: 36 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: A 20 percent chance of showers before noon. Mostly cloudy, then gradually becoming sunny, with a high near 55. North wind 3 to 6 mph.

    High: 55 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 33. Calm wind.

    Low: 33 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 66. Light south wind becoming south southwest 5 to 10 mph in the morning.

    High: 66 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 42. South southwest wind 3 to 7 mph.

    Low: 42 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 68. Light south southwest wind becoming south 5 to 10 mph in the morning.

    High: 68 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 35. Southeast wind around 10 mph becoming north in the evening.

    Low: 35 °F

    Partly Cloudy

  • Sunday

    Sunday: A chance of showers, mainly after noon. Mostly cloudy, with a high near 51. Northeast wind 9 to 11 mph, with gusts as high as 18 mph.

    High: 51 °F

    Chance
    Showers

Detailed Forecast

Today
Mostly cloudy, with a high near 58. Calm wind becoming north northeast around 5 mph.
Tonight
A chance of showers between midnight and 5am. Mostly cloudy, with a low around 36. East northeast wind 3 to 6 mph. Chance of precipitation is 40%.
Thursday
A 20 percent chance of showers before noon. Mostly cloudy, then gradually becoming sunny, with a high near 55. North wind 3 to 6 mph.
Thursday Night
Mostly clear, with a low around 33. Calm wind.
Friday
Sunny, with a high near 66. Light south wind becoming south southwest 5 to 10 mph in the morning.
Friday Night
Clear, with a low around 42. South southwest wind 3 to 7 mph.
Saturday
Sunny, with a high near 68. Light south southwest wind becoming south 5 to 10 mph in the morning.
Saturday Night
Partly cloudy, with a low around 35. Southeast wind around 10 mph becoming north in the evening.
Sunday
A chance of showers, mainly after noon. Mostly cloudy, with a high near 51. Northeast wind 9 to 11 mph, with gusts as high as 18 mph.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 36. East northeast wind around 9 mph.
Monday
A chance of showers. Mostly cloudy, with a high near 48. North northeast wind 8 to 11 mph.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 33. Northeast wind 6 to 8 mph.
Tuesday
A chance of showers. Mostly cloudy, with a high near 51. Northeast wind 6 to 9 mph becoming northwest in the afternoon.
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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:
8:27 am CST Feb 25, 2026
Forecast Valid:
9am CST Feb 25, 2026-6pm CST Mar 3, 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