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.

Partly Cloudy

48°F

9°C

Humidity 58%
Wind Speed S 14 mph
Barometer 29.85 in
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 9 Dec 11:50 am CST
Extended Forecast for

Saint Jacob IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 50. South wind 11 to 16 mph, with gusts as high as 24 mph.

    High: 50 °F

    Mostly Sunny

  • Tonight

    Tonight: A slight chance of rain between midnight and 4am. Mostly cloudy, with a low around 39. South wind 15 to 18 mph becoming west after midnight. Winds could gust as high as 29 mph. Chance of precipitation is 20%.

    Low: 39 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday

    Wednesday: Increasing clouds, with a temperature falling to around 34 by 5pm. Breezy, with a northwest wind 20 to 25 mph decreasing to 14 to 19 mph in the afternoon. Winds could gust as high as 45 mph.

    High: 41 °F⇓

    Increasing
    Clouds and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 26. Northwest wind 6 to 11 mph becoming light after midnight.

    Low: 26 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 39. Light and variable wind becoming west around 6 mph in the morning.

    High: 39 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 29.

    Low: 29 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 17.

    Low: 17 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 28.

    High: 28 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 50. South wind 11 to 16 mph, with gusts as high as 24 mph.
Tonight
A slight chance of rain between midnight and 4am. Mostly cloudy, with a low around 39. South wind 15 to 18 mph becoming west after midnight. Winds could gust as high as 29 mph. Chance of precipitation is 20%.
Wednesday
Increasing clouds, with a temperature falling to around 34 by 5pm. Breezy, with a northwest wind 20 to 25 mph decreasing to 14 to 19 mph in the afternoon. Winds could gust as high as 45 mph.
Wednesday Night
Mostly cloudy, with a low around 26. Northwest wind 6 to 11 mph becoming light after midnight.
Thursday
Mostly cloudy, with a high near 39. Light and variable wind becoming west around 6 mph in the morning.
Thursday Night
Mostly cloudy, with a low around 29.
Friday
Partly sunny, with a high near 42.
Friday Night
Mostly cloudy, with a low around 17.
Saturday
Partly sunny, with a high near 28.
Saturday Night
Mostly cloudy, with a low around 8.
Sunday
Mostly sunny, with a high near 23.
Sunday Night
Partly cloudy, with a low around 13.
Monday
A slight chance of rain and snow. Partly sunny, with a high near 35. Chance of precipitation is 20%.
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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:
11:41 am CST Dec 9, 2025
Forecast Valid:
12pm CST Dec 9, 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