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.

Overcast

37°F

3°C

Humidity 84%
Wind Speed S 10 mph
Barometer 29.93 in
Dewpoint 33°F (1°C)
Visibility 7.00 mi
Wind Chill30°F (-1°C)
Last update 6 Dec 11:55 pm CST
Extended Forecast for

Saint Jacob IL

  • Overnight

    Overnight: Cloudy, with a low around 33. South wind 5 to 7 mph.

    Low: 33 °F

    Cloudy

  • Sunday

    Sunday: A slight chance of drizzle before 5pm. Cloudy, with a high near 38. Light and variable wind becoming north 8 to 13 mph in the morning. Winds could gust as high as 23 mph.

    High: 38 °F

    Slight Chance
    Drizzle

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 20. North wind 7 to 13 mph, with gusts as high as 22 mph.

    Low: 20 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 33. North wind 5 to 7 mph becoming calm in the morning.

    High: 33 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Partly cloudy, with a low around 23. Light south wind increasing to 5 to 10 mph in the evening.

    Low: 23 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 47.

    High: 47 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of rain and snow before midnight, then a slight chance of snow. Mostly cloudy, with a low around 27. Chance of precipitation is 20%.

    Low: 27 °F

    Slight Chance
    Rain/Snow
    then Slight
    Chance Snow

Detailed Forecast

Overnight
Cloudy, with a low around 33. South wind 5 to 7 mph.
Sunday
A slight chance of drizzle before 5pm. Cloudy, with a high near 38. Light and variable wind becoming north 8 to 13 mph in the morning. Winds could gust as high as 23 mph.
Sunday Night
Mostly cloudy, with a low around 20. North wind 7 to 13 mph, with gusts as high as 22 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 33. North wind 5 to 7 mph becoming calm in the morning.
Monday Night
Partly cloudy, with a low around 23. Light south wind increasing to 5 to 10 mph in the evening.
Tuesday
Mostly sunny, with a high near 50.
Tuesday Night
Mostly cloudy, with a low around 40.
Wednesday
Partly sunny, with a high near 47.
Wednesday Night
A slight chance of rain and snow before midnight, then a slight chance of snow. Mostly cloudy, with a low around 27. Chance of precipitation is 20%.
Thursday
A 20 percent chance of snow before noon. Mostly cloudy, with a high near 37.
Thursday Night
Mostly cloudy, with a low around 18.
Friday
Partly sunny, with a high near 27.
Friday Night
Partly cloudy, with a low around 8.
Saturday
Mostly sunny, with a high near 22.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint Jacob IL
 38.72°N 89.77°W (Elev. 499 ft)
Last Update:
9:46 pm CST Dec 6, 2025
Forecast Valid:
12am CST Dec 7, 2025-6pm CST Dec 13, 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