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.

Mostly Cloudy

79°F

26°C

Humidity 79%
Wind Speed W 8 mph
Barometer 29.92 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 15 Oct 4:50 pm CDT
Extended Forecast for

Saint Jacob IL

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 81. Southwest wind around 11 mph.

    High: 81 °F

    Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely before 3am, then a slight chance of showers between 3am and 4am. Increasing clouds, with a low around 47. Southwest wind 10 to 18 mph becoming northwest after midnight. Winds could gust as high as 28 mph. Chance of precipitation is 60%.

    Low: 47 °F

    Showers
    Likely

  • Friday

    Friday: Sunny through mid morning, then becoming mostly cloudy, with a high near 57. Breezy, with a northwest wind 18 to 23 mph, with gusts as high as 30 mph.

    High: 57 °F

    Mostly Cloudy
    and Breezy

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 37. North wind 9 to 18 mph.

    Low: 37 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 60. North wind around 6 mph becoming calm in the afternoon.

    High: 60 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 35.

    Low: 35 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 68.

    High: 68 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 38.

    Low: 38 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 71.

    High: 71 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 81. Southwest wind around 11 mph.
Tonight
Showers and thunderstorms likely before 3am, then a slight chance of showers between 3am and 4am. Increasing clouds, with a low around 47. Southwest wind 10 to 18 mph becoming northwest after midnight. Winds could gust as high as 28 mph. Chance of precipitation is 60%.
Friday
Sunny through mid morning, then becoming mostly cloudy, with a high near 57. Breezy, with a northwest wind 18 to 23 mph, with gusts as high as 30 mph.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 37. North wind 9 to 18 mph.
Saturday
Sunny, with a high near 60. North wind around 6 mph becoming calm in the afternoon.
Saturday Night
Clear, with a low around 35.
Sunday
Sunny, with a high near 68.
Sunday Night
Mostly clear, with a low around 38.
Monday
Mostly sunny, with a high near 71.
Monday Night
Partly cloudy, with a low around 43.
Tuesday
Mostly sunny, with a high near 77.
Tuesday Night
Mostly clear, with a low around 46.
Wednesday
Sunny, with a high near 79.
Wednesday Night
Mostly clear, with a low around 48.
Thursday
Sunny, with a high near 81.
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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:
2:26 pm CDT Oct 15, 2026
Forecast Valid:
5pm CDT Oct 15, 2026-6pm CDT Oct 22, 2026
 
Forecast Discussion
 
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Additional Resources

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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