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.

Fair

91°F

33°C

Humidity 34%
Wind Speed SW 12 mph
Barometer 29.86 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 12 Oct 3:50 pm CDT
Extended Forecast for

Saint Jacob IL

  • Tonight

    Tonight: Mostly clear, with a low around 67. Southwest wind 6 to 10 mph.

    Low: 67 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 94. Southwest wind 6 to 10 mph.

    High: 94 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms, mainly after 3am. Increasing clouds, with a low around 71. South wind 5 to 8 mph.

    Low: 71 °F

    Mostly Clear
    then Chance
    Showers

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 81. Calm wind becoming west around 5 mph. Chance of precipitation is 100%.

    High: 81 °F

    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Light and variable wind. Chance of precipitation is 60%.

    Low: 66 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 82. Chance of precipitation is 80%.

    High: 82 °F

    Showers

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 53.

    Low: 53 °F

    Chance
    Showers

  • Friday

    Friday: Partly sunny, with a high near 64. Breezy.

    High: 64 °F

    Partly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 67. Southwest wind 6 to 10 mph.
Tuesday
Sunny, with a high near 94. Southwest wind 6 to 10 mph.
Tuesday Night
A 40 percent chance of showers and thunderstorms, mainly after 3am. Increasing clouds, with a low around 71. South wind 5 to 8 mph.
Wednesday
Showers and possibly a thunderstorm. High near 81. Calm wind becoming west around 5 mph. Chance of precipitation is 100%.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Light and variable wind. Chance of precipitation is 60%.
Thursday
Showers and possibly a thunderstorm. High near 82. Chance of precipitation is 80%.
Thursday Night
A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 53.
Friday
Partly sunny, with a high near 64. Breezy.
Friday Night
Mostly clear, with a low around 40.
Saturday
Sunny, with a high near 63.
Saturday Night
Mostly clear, with a low around 38.
Sunday
Sunny, with a high near 71.
Sunday Night
Partly cloudy, with a low around 46.
Monday
Mostly sunny, with a high near 77.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Jacob IL
 38.72°N 89.77°W (Elev. 499 ft)
Last Update:
3:16 pm CDT Oct 12, 2026
Forecast Valid:
4pm CDT Oct 12, 2026-6pm CDT Oct 19, 2026
 
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