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.

Overcast

50°F

10°C

Humidity 43%
Wind Speed NE 6 mph
Barometer 29.80 in
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 25 Feb 5:45 pm CST
Extended Forecast for

Saint Jacob IL

  • Tonight

    Tonight: A 50 percent chance of rain, mainly before 4am. Mostly cloudy, with a low around 34. Northeast wind 3 to 6 mph.

    Low: 34 °F

    Slight Chance
    Rain then
    Chance Rain

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 53. East wind around 6 mph becoming calm in the afternoon.

    High: 53 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 34. Calm wind becoming south around 5 mph after midnight.

    Low: 34 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 68. Southwest wind 5 to 13 mph.

    High: 68 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 41. South wind 6 to 8 mph becoming north after midnight.

    Low: 41 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of rain. Sunny, with a high near 62.

    High: 62 °F

    Slight Chance
    Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 31.

    Low: 31 °F

    Partly Cloudy

  • Sunday

    Sunday: A chance of rain and snow, mainly after noon. Cloudy, with a high near 43. Chance of precipitation is 40%.

    High: 43 °F

    Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: Rain and snow likely, mainly before midnight. Cloudy, with a low around 29. Chance of precipitation is 70%.

    Low: 29 °F

    Rain/Snow
    Likely

Detailed Forecast

Tonight
A 50 percent chance of rain, mainly before 4am. Mostly cloudy, with a low around 34. Northeast wind 3 to 6 mph.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 53. East wind around 6 mph becoming calm in the afternoon.
Thursday Night
Mostly clear, with a low around 34. Calm wind becoming south around 5 mph after midnight.
Friday
Sunny, with a high near 68. Southwest wind 5 to 13 mph.
Friday Night
Mostly clear, with a low around 41. South wind 6 to 8 mph becoming north after midnight.
Saturday
A 20 percent chance of rain. Sunny, with a high near 62.
Saturday Night
Partly cloudy, with a low around 31.
Sunday
A chance of rain and snow, mainly after noon. Cloudy, with a high near 43. Chance of precipitation is 40%.
Sunday Night
Rain and snow likely, mainly before midnight. Cloudy, with a low around 29. Chance of precipitation is 70%.
Monday
A chance of rain and snow before noon, then a slight chance of rain. Cloudy, with a high near 39. Chance of precipitation is 30%.
Monday Night
A chance of rain or freezing rain. Cloudy, with a low around 28. Chance of precipitation is 40%.
Tuesday
A 50 percent chance of rain. Mostly cloudy, with a high near 44.
Tuesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 33.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 51.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint Jacob IL
 38.72°N 89.77°W (Elev. 499 ft)
Last Update:
4:56 pm CST Feb 25, 2026
Forecast Valid:
6pm CST Feb 25, 2026-6pm CST Mar 4, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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