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

30°F

-1°C

Humidity 80%
Wind Speed N 13 mph
Barometer 30.28 in
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill20°F (-7°C)
Last update 7 Dec 7:50 pm CST
Extended Forecast for

Saint Jacob IL

  • Tonight

    Tonight: A 20 percent chance of snow before 10pm. Cloudy, then gradual clearing toward daybreak, with a low around 22. North wind 7 to 14 mph, with gusts as high as 24 mph.

    Low: 22 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 34. North wind 5 to 7 mph becoming light and variable in the afternoon.

    High: 34 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 24. Light south wind increasing to 6 to 11 mph in the evening.

    Low: 24 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 51. Southwest wind 10 to 14 mph.

    High: 51 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a steady temperature around 45. South wind 14 to 17 mph becoming west after midnight. Winds could gust as high as 25 mph.

    Low: 45 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a temperature rising to near 44 by 11am, then falling to around 38 during the remainder of the day.

    High: 44 °F⇓

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Thursday

    Thursday: A 30 percent chance of snow, mainly before noon. Mostly cloudy, with a high near 35.

    High: 35 °F

    Chance Snow

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 18.

    Low: 18 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of snow before 10pm. Cloudy, then gradual clearing toward daybreak, with a low around 22. North wind 7 to 14 mph, with gusts as high as 24 mph.
Monday
Mostly sunny, with a high near 34. North wind 5 to 7 mph becoming light and variable in the afternoon.
Monday Night
Partly cloudy, with a low around 24. Light south wind increasing to 6 to 11 mph in the evening.
Tuesday
Mostly sunny, with a high near 51. Southwest wind 10 to 14 mph.
Tuesday Night
Mostly cloudy, with a steady temperature around 45. South wind 14 to 17 mph becoming west after midnight. Winds could gust as high as 25 mph.
Wednesday
Partly sunny, with a temperature rising to near 44 by 11am, then falling to around 38 during the remainder of the day.
Wednesday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 26.
Thursday
A 30 percent chance of snow, mainly before noon. Mostly cloudy, with a high near 35.
Thursday Night
Mostly cloudy, with a low around 18.
Friday
Partly sunny, with a high near 26.
Friday Night
Mostly cloudy, with a low around 5.
Saturday
Partly sunny and cold, with a high near 20.
Saturday Night
Mostly cloudy, with a low around 7.
Sunday
Mostly sunny, with a high near 25.
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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:
6:51 pm CST Dec 7, 2025
Forecast Valid:
7pm CST Dec 7, 2025-6pm CST Dec 14, 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