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

77°F

25°C

Humidity 51%
Wind Speed E 8 mph
Barometer 30.11 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 3 Aug 1:50 pm CDT
Extended Forecast for

Saint Jacob IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 81. Northeast wind around 7 mph.

    High: 81 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 61. Northeast wind 3 to 6 mph.

    Low: 61 °F

    Mostly Cloudy

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms, mainly after 2pm. Mostly cloudy, with a high near 80. Northeast wind 3 to 7 mph.

    High: 80 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Monday Night

    Monday Night: A chance of thunderstorms before 7pm. Partly cloudy, with a low around 67. East wind around 6 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 67 °F

    Chance
    T-storms then
    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 83. Calm wind becoming east around 5 mph in the afternoon.

    High: 83 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 81. Northeast wind around 7 mph.
Tonight
Mostly cloudy, with a low around 61. Northeast wind 3 to 6 mph.
Monday
A 30 percent chance of showers and thunderstorms, mainly after 2pm. Mostly cloudy, with a high near 80. Northeast wind 3 to 7 mph.
Monday Night
A chance of thunderstorms before 7pm. Partly cloudy, with a low around 67. East wind around 6 mph becoming calm in the evening. Chance of precipitation is 30%.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 83. Calm wind becoming east around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 67.
Wednesday
Mostly sunny, with a high near 86.
Wednesday Night
Mostly clear, with a low around 67.
Thursday
Sunny, with a high near 87.
Thursday Night
Mostly clear, with a low around 69.
Friday
Sunny, with a high near 89.
Friday Night
Mostly clear, with a low around 71.
Saturday
Sunny, with a high near 90.
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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:
1:26 pm CDT Aug 3, 2025
Forecast Valid:
2pm CDT Aug 3, 2025-6pm CDT Aug 9, 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