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

32°F

0°C

Humidity 60%
Wind Speed E 6 mph
Barometer 30.27 in
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill26°F (-3°C)
Last update 8 Dec 2:50 pm CST
Extended Forecast for

Saint Jacob IL

  • Tonight

    Tonight: Increasing clouds, with a low around 24. Light and variable wind becoming south 5 to 10 mph in the evening.

    Low: 24 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly sunny, with a high near 52. Southwest wind 10 to 15 mph, with gusts as high as 23 mph.

    High: 52 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 38. Breezy, with a south wind 17 to 22 mph becoming west after midnight. Winds could gust as high as 30 mph.

    Low: 38 °F

    Mostly Cloudy
    and Breezy

  • Wednesday

    Wednesday: Partly sunny, with a high near 46. Breezy, with a northwest wind 16 to 26 mph, with gusts as high as 34 mph.

    High: 46 °F

    Partly Sunny
    and Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 25. Northwest wind 5 to 11 mph.

    Low: 25 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of snow. Mostly cloudy, with a high near 38.

    High: 38 °F

    Slight Chance
    Snow

  • Thursday Night

    Thursday Night: A 20 percent chance of snow. Mostly cloudy, with a low around 25.

    Low: 25 °F

    Slight Chance
    Snow

  • Friday

    Friday: Partly sunny, with a high near 35.

    High: 35 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 13.

    Low: 13 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 24. Light and variable wind becoming south 5 to 10 mph in the evening.
Tuesday
Mostly sunny, with a high near 52. Southwest wind 10 to 15 mph, with gusts as high as 23 mph.
Tuesday Night
Mostly cloudy, with a low around 38. Breezy, with a south wind 17 to 22 mph becoming west after midnight. Winds could gust as high as 30 mph.
Wednesday
Partly sunny, with a high near 46. Breezy, with a northwest wind 16 to 26 mph, with gusts as high as 34 mph.
Wednesday Night
Mostly cloudy, with a low around 25. Northwest wind 5 to 11 mph.
Thursday
A 20 percent chance of snow. Mostly cloudy, with a high near 38.
Thursday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 25.
Friday
Partly sunny, with a high near 35.
Friday Night
Mostly cloudy, with a low around 13.
Saturday
Partly sunny, with a high near 24.
Saturday Night
Mostly cloudy, with a low around 13.
Sunday
Mostly sunny, with a high near 28.
Sunday Night
Mostly cloudy, with a low around 19.
Monday
A 20 percent chance of rain. Mostly cloudy, with a high near 38.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Jacob IL
 38.72°N 89.77°W (Elev. 499 ft)
Last Update:
3:16 pm CST Dec 8, 2025
Forecast Valid:
3pm CST Dec 8, 2025-6pm CST Dec 15, 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