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

Hazardous Weather Conditions

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

A Few Clouds

85°F

29°C

Humidity 46%
Wind Speed NW 10 mph
Barometer 30.01 in (1015.2 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 19 Jun 5:51 pm CDT
Extended Forecast for

Saint John MO

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

  • Tonight

    Tonight: Mostly clear, with a low around 69. Northwest wind around 6 mph becoming calm.

    Low: 69 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 93. South wind 6 to 10 mph.

    High: 93 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 77. South wind 9 to 11 mph, with gusts as high as 21 mph.

    Low: 77 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 97. Heat index values as high as 105. Southwest wind 9 to 13 mph, with gusts as high as 22 mph.

    High: 97 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 78. South wind 7 to 10 mph, with gusts as high as 20 mph.

    Low: 78 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 77.

    Low: 77 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 78.

    Low: 78 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 69. Northwest wind around 6 mph becoming calm.
Friday
Sunny, with a high near 93. South wind 6 to 10 mph.
Friday Night
Mostly clear, with a low around 77. South wind 9 to 11 mph, with gusts as high as 21 mph.
Saturday
Sunny and hot, with a high near 97. Heat index values as high as 105. Southwest wind 9 to 13 mph, with gusts as high as 22 mph.
Saturday Night
Mostly clear, with a low around 78. South wind 7 to 10 mph, with gusts as high as 20 mph.
Sunday
Sunny and hot, with a high near 97.
Sunday Night
Mostly clear, with a low around 77.
Monday
Sunny and hot, with a high near 97.
Monday Night
Mostly clear, with a low around 78.
Tuesday
A 20 percent chance of showers and thunderstorms before 1pm. Sunny, with a high near 95.
Tuesday Night
Partly cloudy, with a low around 76.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 95.
Wednesday Night
Partly cloudy, with a low around 76.
Thursday
A 30 percent chance of showers and thunderstorms. Sunny, with a high near 93.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Saint John MO
 38.71°N 90.34°W (Elev. 597 ft)
Last Update:
5:52 pm CDT Jun 19, 2025
Forecast Valid:
6pm CDT Jun 19, 2025-6pm CDT Jun 26, 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