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.

Overcast

36°F

2°C

Humidity 37%
Wind Speed SW 15 mph
Barometer 30.10 in (1019.9 mb)
Dewpoint 12°F (-11°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 21 Jan 2:51 am CST
Extended Forecast for

Florissant MO

  • Overnight

    Overnight: Cloudy, with a low around 30. Southwest wind around 10 mph, with gusts as high as 20 mph.

    Low: 30 °F

    Cloudy

  • Wednesday

    Wednesday: Partly sunny, then gradually becoming sunny, with a high near 45. West wind 10 to 15 mph, with gusts as high as 26 mph.

    High: 45 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 24. West wind 6 to 13 mph becoming northwest after midnight. Winds could gust as high as 24 mph.

    Low: 24 °F

    Mostly Clear

  • Thursday

    Thursday: Partly sunny, with a high near 38. West wind around 6 mph becoming calm in the afternoon.

    High: 38 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 9. Light northwest wind becoming north 11 to 16 mph in the evening. Winds could gust as high as 24 mph.

    Low: 9 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy and cold, with a high near 14.

    High: 14 °F

    Cold

  • Friday Night

    Friday Night: Cloudy, with a low around 2.

    Low: 2 °F

    Cloudy

  • Saturday

    Saturday: A 50 percent chance of snow. Cloudy and cold, with a high near 13.

    High: 13 °F

    Chance Snow

  • Saturday Night

    Saturday Night: A 50 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 8.

    Low: 8 °F

    Chance Snow
    then Slight
    Chance Snow

Detailed Forecast

Overnight
Cloudy, with a low around 30. Southwest wind around 10 mph, with gusts as high as 20 mph.
Wednesday
Partly sunny, then gradually becoming sunny, with a high near 45. West wind 10 to 15 mph, with gusts as high as 26 mph.
Wednesday Night
Mostly clear, with a low around 24. West wind 6 to 13 mph becoming northwest after midnight. Winds could gust as high as 24 mph.
Thursday
Partly sunny, with a high near 38. West wind around 6 mph becoming calm in the afternoon.
Thursday Night
Mostly cloudy, with a low around 9. Light northwest wind becoming north 11 to 16 mph in the evening. Winds could gust as high as 24 mph.
Friday
Mostly cloudy and cold, with a high near 14.
Friday Night
Cloudy, with a low around 2.
Saturday
A 50 percent chance of snow. Cloudy and cold, with a high near 13.
Saturday Night
A 50 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 8.
Sunday
A 20 percent chance of snow before noon. Partly sunny and cold, with a high near 20.
Sunday Night
Partly cloudy, with a low around 6.
Monday
Sunny, with a high near 23.
Monday Night
Mostly clear, with a low around 11.
Tuesday
Mostly sunny, with a high near 36.
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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:
3:16 am CST Jan 21, 2026
Forecast Valid:
3am CST Jan 21, 2026-6pm CST Jan 27, 2026
 
Forecast Discussion
 
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Additional Resources

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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