National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

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.
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:
2:26 am CDT Jun 27, 2026
Forecast Valid:
2am CDT Jun 27, 2026-6pm CDT Jul 3, 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