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

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Partly Cloudy

21°F

-6°C

Humidity 86%
Wind Speed E 3 mph
Barometer 30.43 in
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Last update 1 Dec 6:50 am CST
Extended Forecast for

Saint Jacob IL

  • Today

    Today: A 50 percent chance of snow, mainly after 3pm. Cloudy, with a high near 30. East wind around 6 mph becoming calm in the afternoon.

    High: 30 °F

    Mostly Cloudy
    then Chance
    Snow

  • Tonight

    Tonight: Snow, mainly before 11pm. Low around 19. Calm wind becoming northwest 5 to 7 mph after midnight. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.

    Low: 19 °F

    Snow then
    Slight Chance
    Snow

  • Tuesday

    Tuesday: Partly sunny, with a high near 30. Northwest wind 5 to 7 mph becoming calm in the afternoon.

    High: 30 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 19. Calm wind becoming south around 6 mph after midnight.

    Low: 19 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 39. South wind 5 to 9 mph becoming west in the afternoon.

    High: 39 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 15.

    Low: 15 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 23.

    High: 23 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 12.

    Low: 12 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Friday

    Friday: A 30 percent chance of snow. Mostly cloudy, with a high near 34.

    High: 34 °F

    Chance Snow

Detailed Forecast

Today
A 50 percent chance of snow, mainly after 3pm. Cloudy, with a high near 30. East wind around 6 mph becoming calm in the afternoon.
Tonight
Snow, mainly before 11pm. Low around 19. Calm wind becoming northwest 5 to 7 mph after midnight. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.
Tuesday
Partly sunny, with a high near 30. Northwest wind 5 to 7 mph becoming calm in the afternoon.
Tuesday Night
Partly cloudy, with a low around 19. Calm wind becoming south around 6 mph after midnight.
Wednesday
Partly sunny, with a high near 39. South wind 5 to 9 mph becoming west in the afternoon.
Wednesday Night
Mostly cloudy, with a low around 15.
Thursday
Mostly sunny, with a high near 23.
Thursday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 12.
Friday
A 30 percent chance of snow. Mostly cloudy, with a high near 34.
Friday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 25.
Saturday
Partly sunny, with a high near 39.
Saturday Night
Mostly cloudy, with a low around 25.
Sunday
Mostly cloudy, with a high near 36.
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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:
4:36 am CST Dec 1, 2025
Forecast Valid:
7am CST Dec 1, 2025-6pm CST Dec 7, 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