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

55°F

13°C

Humidity 69%
Wind Speed Calm
Barometer 29.89 in (1011.2 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 21 Mar 3:51 am CDT
Extended Forecast for

Florissant MO

  • Today

    Today: Sunny, with a high near 89. Light and variable wind becoming southwest 5 to 7 mph in the morning.

    High: 89 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 66. South wind 6 to 9 mph.

    Low: 66 °F

    Mostly Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 88. Southwest wind 9 to 16 mph becoming northwest in the afternoon. Winds could gust as high as 28 mph.

    High: 88 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: A 20 percent chance of showers before 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 40. Breezy, with a north wind 11 to 21 mph, with gusts as high as 32 mph.

    Low: 40 °F

    Slight Chance
    Showers and
    Breezy

  • Monday

    Monday: Mostly sunny, with a high near 58. Northeast wind 7 to 9 mph.

    High: 58 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 42.

    Low: 42 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 63.

    High: 63 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 46.

    Low: 46 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 72.

    High: 72 °F

    Slight Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 89. Light and variable wind becoming southwest 5 to 7 mph in the morning.
Tonight
Mostly clear, with a low around 66. South wind 6 to 9 mph.
Sunday
Increasing clouds, with a high near 88. Southwest wind 9 to 16 mph becoming northwest in the afternoon. Winds could gust as high as 28 mph.
Sunday Night
A 20 percent chance of showers before 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 40. Breezy, with a north wind 11 to 21 mph, with gusts as high as 32 mph.
Monday
Mostly sunny, with a high near 58. Northeast wind 7 to 9 mph.
Monday Night
Mostly cloudy, with a low around 42.
Tuesday
Partly sunny, with a high near 63.
Tuesday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 46.
Wednesday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 72.
Wednesday Night
A 20 percent chance of showers. Partly cloudy, with a low around 57.
Thursday
A 20 percent chance of showers. Mostly sunny, with a high near 82.
Thursday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 46.
Friday
A 30 percent chance of showers. Partly sunny, with a high near 57.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Florissant MO
 38.8°N 90.31°W (Elev. 525 ft)
Last Update:
4:16 am CDT Mar 21, 2026
Forecast Valid:
4am CDT Mar 21, 2026-6pm CDT Mar 27, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation