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.

Mostly Cloudy

70°F

21°C

Humidity 84%
Wind Speed W 8 mph
Barometer 29.90 in (1011.3 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 19 Jun 2:51 am 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

  • Overnight

    Overnight: Partly cloudy, with a low around 67. West wind around 7 mph.

    Low: 67 °F

    Partly Cloudy

  • Juneteenth

    Juneteenth: Partly sunny, then gradually becoming sunny, with a high near 86. Northwest wind around 8 mph.

    High: 86 °F

    Becoming
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 68. West wind 5 to 7 mph becoming light and variable.

    Low: 68 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 93. Light south wind increasing to 5 to 10 mph in the morning.

    High: 93 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 77. South wind around 10 mph.

    Low: 77 °F

    Mostly Clear

  • Saturday

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

    High: 97 °F

    Hot

  • Saturday Night

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

    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 78.

    Low: 78 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 67. West wind around 7 mph.
Juneteenth
Partly sunny, then gradually becoming sunny, with a high near 86. Northwest wind around 8 mph.
Thursday Night
Mostly clear, with a low around 68. West wind 5 to 7 mph becoming light and variable.
Friday
Sunny, with a high near 93. Light south wind increasing to 5 to 10 mph in the morning.
Friday Night
Mostly clear, with a low around 77. South wind around 10 mph.
Saturday
Sunny and hot, with a high near 97.
Saturday Night
Mostly clear, with a low around 78.
Sunday
Sunny and hot, with a high near 97.
Sunday Night
Mostly clear, with a low around 78.
Monday
Sunny and hot, with a high near 97.
Monday Night
Partly cloudy, with a low around 78.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly 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 94.
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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:
2:51 am CDT Jun 19, 2025
Forecast Valid:
3am CDT Jun 19, 2025-6pm CDT Jun 25, 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