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

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Mostly Cloudy

46°F

8°C

Humidity 63%
Wind Speed SE 10 mph
Barometer 29.91 in (1013.3 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 6 Dec 2:51 pm CST
Extended Forecast for

Florissant MO

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 44. East wind 5 to 7 mph.

    High: 44 °F

    Partly Sunny

  • Tonight

    Tonight: A slight chance of rain between midnight and 2am. Mostly cloudy, with a low around 34. Southeast wind 5 to 7 mph. Chance of precipitation is 20%.

    Low: 34 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Sunday

    Sunday: A slight chance of drizzle before 1pm. Mostly cloudy, with a temperature rising to near 37 by 9am, then falling to around 30 during the remainder of the day. Southwest wind 5 to 13 mph becoming north in the afternoon. Winds could gust as high as 22 mph.

    High: 37 °F⇓

    Slight Chance
    Drizzle

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 19. North wind 5 to 11 mph.

    Low: 19 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 32. North wind around 5 mph becoming light and variable.

    High: 32 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 47.

    High: 47 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 44. East wind 5 to 7 mph.
Tonight
A slight chance of rain between midnight and 2am. Mostly cloudy, with a low around 34. Southeast wind 5 to 7 mph. Chance of precipitation is 20%.
Sunday
A slight chance of drizzle before 1pm. Mostly cloudy, with a temperature rising to near 37 by 9am, then falling to around 30 during the remainder of the day. Southwest wind 5 to 13 mph becoming north in the afternoon. Winds could gust as high as 22 mph.
Sunday Night
Mostly cloudy, with a low around 19. North wind 5 to 11 mph.
Monday
Mostly sunny, with a high near 32. North wind around 5 mph becoming light and variable.
Monday Night
Partly cloudy, with a low around 25.
Tuesday
Mostly sunny, with a high near 50.
Tuesday Night
Mostly cloudy, with a low around 40.
Wednesday
Partly sunny, with a high near 47.
Wednesday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 28.
Thursday
A 20 percent chance of snow. Mostly cloudy, with a high near 38.
Thursday Night
Mostly cloudy, with a low around 20.
Friday
Partly sunny, with a high near 27.
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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:
2:11 pm CST Dec 6, 2025
Forecast Valid:
2pm CST Dec 6, 2025-6pm CST Dec 12, 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