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.

Fair

90°F

32°C

Humidity 49%
Wind Speed S 18 G 28 mph
Barometer 29.90 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index94°F (34°C)
Last update 20 Jun 5:50 pm CDT
Extended Forecast for

Saint Jacob IL

Extreme Heat Warning June 21, 12:00pm until June 24, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning

  • Tonight

    Tonight: Clear, with a low around 75. South wind 9 to 13 mph, with gusts as high as 21 mph.

    Low: 75 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 95. Heat index values as high as 106. South wind 9 to 16 mph, with gusts as high as 25 mph.

    High: 95 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 74. South wind 8 to 13 mph, with gusts as high as 22 mph.

    Low: 74 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 96. Heat index values as high as 103. Southwest wind 7 to 11 mph.

    High: 96 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 75. South wind 6 to 10 mph.

    Low: 75 °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 75.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 93.

    High: 93 °F

    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 75.

    Low: 75 °F

    Partly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 75. South wind 9 to 13 mph, with gusts as high as 21 mph.
Saturday
Sunny, with a high near 95. Heat index values as high as 106. South wind 9 to 16 mph, with gusts as high as 25 mph.
Saturday Night
Clear, with a low around 74. South wind 8 to 13 mph, with gusts as high as 22 mph.
Sunday
Sunny, with a high near 96. Heat index values as high as 103. Southwest wind 7 to 11 mph.
Sunday Night
Mostly clear, with a low around 75. South wind 6 to 10 mph.
Monday
Sunny, with a high near 95.
Monday Night
Mostly clear, with a low around 75.
Tuesday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 93.
Tuesday Night
Partly cloudy, with a low around 75.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 93.
Wednesday Night
Partly cloudy, with a low around 75.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Jacob IL
 38.7°N 89.77°W (Elev. 509 ft)
Last Update:
2:21 pm CDT Jun 20, 2025
Forecast Valid:
6pm CDT Jun 20, 2025-6pm CDT Jun 27, 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