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

75°F

24°C

Humidity 74%
Wind Speed NE 5 mph
Barometer 29.97 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 29 Jul 8:45 pm CDT
Extended Forecast for

Saint Jacob IL

  • Tonight

    Tonight: Clear, with a low around 65. Northeast wind 3 to 5 mph.

    Low: 65 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 85. East wind 3 to 6 mph.

    High: 85 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 66. East wind around 5 mph becoming calm in the evening.

    Low: 66 °F

    Partly Cloudy

  • Friday

    Friday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 83. South wind 5 to 13 mph. Chance of precipitation is 60%.

    High: 83 °F

    Chance
    Showers then
    Showers
    Likely

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm before 4am, then showers likely. Low around 68. South wind 8 to 13 mph becoming southwest after midnight. Chance of precipitation is 80%.

    Low: 68 °F

    Showers

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 79. Chance of precipitation is 40%.

    High: 79 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 65.

    Low: 65 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 65. Northeast wind 3 to 5 mph.
Thursday
Sunny, with a high near 85. East wind 3 to 6 mph.
Thursday Night
Partly cloudy, with a low around 66. East wind around 5 mph becoming calm in the evening.
Friday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 83. South wind 5 to 13 mph. Chance of precipitation is 60%.
Friday Night
Showers and possibly a thunderstorm before 4am, then showers likely. Low around 68. South wind 8 to 13 mph becoming southwest after midnight. Chance of precipitation is 80%.
Saturday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 79. Chance of precipitation is 40%.
Saturday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 65.
Sunday
A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 82.
Sunday Night
Mostly clear, with a low around 65.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 84.
Monday Night
Mostly clear, with a low around 67.
Tuesday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 87.
Tuesday Night
Mostly clear, with a low around 68.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
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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:
5:26 pm CDT Jul 29, 2026
Forecast Valid:
9pm CDT Jul 29, 2026-6pm CDT Aug 5, 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