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

50°F

10°C

Humidity 45%
Wind Speed S 6 mph
Barometer 30.14 in
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 25 Mar 1:55 am CDT
Extended Forecast for

2 Miles WNW Saint Jacob IL

  • Overnight

    Overnight: Partly cloudy, with a low around 42. Light southeast wind.

    Low: 42 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 75. Light and variable wind becoming south 8 to 13 mph in the morning.

    High: 75 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms between 11pm and midnight. Mostly cloudy, then gradually becoming clear, with a low around 62. South wind around 11 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    Low: 62 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 88. Southwest wind 10 to 16 mph, with gusts as high as 26 mph.

    High: 88 °F

    Sunny

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm, mainly before 4am, then rain after 4am. Low around 43. Southwest wind 11 to 18 mph becoming north after midnight. Winds could gust as high as 28 mph. Chance of precipitation is 90%.

    Low: 43 °F

    Showers
    Likely then
    Showers

  • Friday

    Friday: Rain, mainly before 7am. High near 52. Chance of precipitation is 80%.

    High: 52 °F

    Rain then
    Chance Rain

  • Friday Night

    Friday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 57.

    High: 57 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 42. Light southeast wind.
Wednesday
Mostly sunny, with a high near 75. Light and variable wind becoming south 8 to 13 mph in the morning.
Wednesday Night
A slight chance of showers and thunderstorms between 11pm and midnight. Mostly cloudy, then gradually becoming clear, with a low around 62. South wind around 11 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Thursday
Sunny, with a high near 88. Southwest wind 10 to 16 mph, with gusts as high as 26 mph.
Thursday Night
Showers and possibly a thunderstorm, mainly before 4am, then rain after 4am. Low around 43. Southwest wind 11 to 18 mph becoming north after midnight. Winds could gust as high as 28 mph. Chance of precipitation is 90%.
Friday
Rain, mainly before 7am. High near 52. Chance of precipitation is 80%.
Friday Night
Mostly clear, with a low around 32.
Saturday
Sunny, with a high near 57.
Saturday Night
Partly cloudy, with a low around 40.
Sunday
Partly sunny, with a high near 64.
Sunday Night
Mostly cloudy, with a low around 53.
Monday
A 20 percent chance of rain and thunderstorms. Mostly sunny, with a high near 80.
Monday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 60.
Tuesday
A 40 percent chance of rain and thunderstorms. Partly sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WNW Saint Jacob IL
 38.74°N 89.8°W (Elev. 479 ft)
Last Update:
1:26 am CDT Mar 25, 2026
Forecast Valid:
2am CDT Mar 25, 2026-6pm CDT Mar 31, 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