National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

45°F

7°C

Humidity 39%
Wind Speed Vrbl 3 mph
Barometer 30.03 in
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Last update 16 Nov 6:50 pm CST
Extended Forecast for

Saint Jacob IL

  • Tonight

    Tonight: Clear, with a low around 35. Light and variable wind.

    Low: 35 °F

    Clear

  • Monday

    Monday: Isolated showers after 5pm. Increasing clouds, with a high near 59. Light east wind becoming southeast 6 to 11 mph in the morning. Chance of precipitation is 20%.

    High: 59 °F

    Sunny then
    Isolated
    Showers

  • Monday Night

    Monday Night: Showers and thunderstorms likely before 3am, then scattered showers. Mostly cloudy, with a low around 47. Southeast wind around 11 mph, with gusts as high as 22 mph. Chance of precipitation is 70%.

    Low: 47 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A 30 percent chance of rain, mainly before noon. Partly sunny, with a high near 71. Southeast wind 7 to 10 mph becoming west in the afternoon.

    High: 71 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 48. Northeast wind 3 to 6 mph.

    Low: 48 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 64.

    High: 64 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 50.

    Low: 50 °F

    Chance Rain

  • Thursday

    Thursday: Rain and possibly a thunderstorm. High near 66. Chance of precipitation is 90%.

    High: 66 °F

    Rain

  • Thursday Night

    Thursday Night: Rain likely. Cloudy, with a low around 55. Chance of precipitation is 70%.

    Low: 55 °F

    Rain Likely

Detailed Forecast

Tonight
Clear, with a low around 35. Light and variable wind.
Monday
Isolated showers after 5pm. Increasing clouds, with a high near 59. Light east wind becoming southeast 6 to 11 mph in the morning. Chance of precipitation is 20%.
Monday Night
Showers and thunderstorms likely before 3am, then scattered showers. Mostly cloudy, with a low around 47. Southeast wind around 11 mph, with gusts as high as 22 mph. Chance of precipitation is 70%.
Tuesday
A 30 percent chance of rain, mainly before noon. Partly sunny, with a high near 71. Southeast wind 7 to 10 mph becoming west in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 48. Northeast wind 3 to 6 mph.
Wednesday
Mostly cloudy, with a high near 64.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 50.
Thursday
Rain and possibly a thunderstorm. High near 66. Chance of precipitation is 90%.
Thursday Night
Rain likely. Cloudy, with a low around 55. Chance of precipitation is 70%.
Friday
A 50 percent chance of rain. Partly sunny, with a high near 67.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 44.
Saturday
Partly sunny, with a high near 56.
Saturday Night
Mostly cloudy, with a low around 39.
Sunday
A 20 percent chance of rain. Mostly sunny, with a high near 58.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Jacob IL
 38.7°N 89.77°W (Elev. 509 ft)
Last Update:
6:21 pm CST Nov 16, 2025
Forecast Valid:
7pm CST Nov 16, 2025-6pm CST Nov 23, 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