Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Mostly Cloudy

87°F

31°C

Humidity 65%
Wind Speed SE 6 mph
Barometer 30.02 in (1015.4 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index95°F (35°C)
Last update 18 Jul 5:51 pm CDT
Extended Forecast for

Florissant MO

Extreme Heat Warning July 19, 12:00pm until July 23, 07:00pm
Click here for hazard details and duration
Extreme Heat Warning
  • Tonight

    Tonight: Scattered showers and thunderstorms.  Mostly cloudy, with a low around 76. South wind 3 to 5 mph.  Chance of precipitation is 30%.

    Low: 76 °F

    Scattered
    T-storms

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 7am.  Mostly sunny, with a high near 94. Heat index values as high as 105. Southwest wind 5 to 7 mph.  Chance of precipitation is 50%.

    High: 94 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms.  Mostly clear, with a low around 78. Southwest wind around 6 mph.  Chance of precipitation is 20%.

    Low: 78 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms.  Mostly sunny, with a high near 96. Heat index values as high as 105. West wind around 6 mph.

    High: 96 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms.  Partly cloudy, with a low around 78. South wind 3 to 6 mph.

    Low: 78 °F

    Chance
    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms.  Mostly sunny, with a high near 96.

    High: 96 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms before 1am.  Partly cloudy, with a low around 78.

    Low: 78 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: Sunny and hot, with a high near 98.

    High: 98 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 79.

    Low: 79 °F

    Mostly Clear

Detailed Forecast

Tonight
Scattered showers and thunderstorms. Mostly cloudy, with a low around 76. South wind 3 to 5 mph. Chance of precipitation is 30%.
Saturday
A chance of showers, with thunderstorms also possible after 7am. Mostly sunny, with a high near 94. Heat index values as high as 105. Southwest wind 5 to 7 mph. Chance of precipitation is 50%.
Saturday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 78. Southwest wind around 6 mph. Chance of precipitation is 20%.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96. Heat index values as high as 105. West wind around 6 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 78. South wind 3 to 6 mph.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96.
Monday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 78.
Tuesday
Sunny and hot, with a high near 98.
Tuesday Night
Mostly clear, with a low around 79.
Wednesday
Sunny and hot, with a high near 99.
Wednesday Night
Mostly clear, with a low around 79.
Thursday
Sunny and hot, with a high near 99.
Thursday Night
Mostly clear, with a low around 78.
Friday
Sunny and hot, with a high near 98.
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ABOUT THIS FORECAST

 
Point Forecast:
Florissant MO
 38.8°N 90.31°W (Elev. 525 ft)
5:36 pm CDT Jul 18, 2025
6pm CDT Jul 18, 2025-6pm CDT Jul 25, 2025
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database