Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Overcast

73°F

23°C

Humidity 96%
Wind Speed Calm
Barometer 29.90 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 27 Jun 2:15 am CDT
Extended Forecast for

Saint Jacob IL

Extreme Heat Watch June 28, 12:00pm until July 3, 12:00am
Click here for hazard details and duration
Extreme Heat Watch
  • Overnight

    Overnight: A slight chance of showers and thunderstorms.  Mostly cloudy, with a low around 71. Calm wind.  Chance of precipitation is 20%.

    Low: 71 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 10am.  Mostly cloudy, with a high near 85. Light southwest wind.  Chance of precipitation is 30%.

    High: 85 °F

    Chance
    Showers then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms, mainly between 9pm and 5am.  Increasing clouds, with a low around 72. Light southeast wind.

    Low: 72 °F

    Chance
    T-storms

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 93. Heat index values as high as 110. South wind 5 to 11 mph.

    High: 93 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 74. South wind 5 to 11 mph.

    Low: 74 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 76.

    Low: 76 °F

    Clear

Detailed Forecast

Overnight
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Calm wind. Chance of precipitation is 20%.
Saturday
A chance of showers, with thunderstorms also possible after 10am. Mostly cloudy, with a high near 85. Light southwest wind. Chance of precipitation is 30%.
Saturday Night
A 40 percent chance of showers and thunderstorms, mainly between 9pm and 5am. Increasing clouds, with a low around 72. Light southeast wind.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 93. Heat index values as high as 110. South wind 5 to 11 mph.
Sunday Night
Mostly clear, with a low around 74. South wind 5 to 11 mph.
Monday
Sunny, with a high near 95.
Monday Night
Mostly clear, with a low around 76.
Tuesday
Sunny, with a high near 96.
Tuesday Night
Clear, with a low around 76.
Wednesday
Sunny, with a high near 95.
Wednesday Night
Mostly clear, with a low around 76.
Thursday
Sunny, with a high near 94.
Thursday Night
Mostly clear, with a low around 76.
Friday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 93.
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Jacob IL
 38.72°N 89.77°W (Elev. 499 ft)
2:26 am CDT Jun 27, 2026
2am CDT Jun 27, 2026-6pm CDT Jul 3, 2026
 
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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