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

Heavy Rain and Flooding Possible in the Southwest U.S, Ohio Valley, and Hawaii

Heavy rainfall is expected to continue through Thursday over New Mexico into far west Texas. Flash flooding and debris flows in wildfire burn areas will be possible. Heavy rain and flash flooding is also expected over the southern Appalachians and Ohio Valley. Tropical Depression 15-E, southeast of Hawaii, is expected to bring heavy rain beginning today to the Big Island and Maui. Read More >

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Overcast

69°F

21°C

Humidity 63%
Wind Speed NE 7 mph
Barometer 30.26 in (1024.2 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 23 Sep 4:51 pm CDT
Extended Forecast for

Florissant MO

  • Tonight

    Tonight: Mostly cloudy, with a low around 59. Northeast wind 3 to 8 mph.

    Low: 59 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 75. Northeast wind 3 to 5 mph.

    High: 75 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 63. Northeast wind around 5 mph becoming calm in the evening.

    Low: 63 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 79. Calm wind becoming east around 5 mph in the afternoon.

    High: 79 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 60. Northeast wind around 5 mph.

    Low: 60 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers. Mostly cloudy, with a high near 73.

    High: 73 °F

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 60.

    Low: 60 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A 20 percent chance of showers before 1pm. Partly sunny, with a high near 78.

    High: 78 °F

    Slight Chance
    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 60.

    Low: 60 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 59. Northeast wind 3 to 8 mph.
Thursday
Partly sunny, with a high near 75. Northeast wind 3 to 5 mph.
Thursday Night
Mostly cloudy, with a low around 63. Northeast wind around 5 mph becoming calm in the evening.
Friday
Partly sunny, with a high near 79. Calm wind becoming east around 5 mph in the afternoon.
Friday Night
Mostly cloudy, with a low around 60. Northeast wind around 5 mph.
Saturday
A 20 percent chance of showers. Mostly cloudy, with a high near 73.
Saturday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 60.
Sunday
A 20 percent chance of showers before 1pm. Partly sunny, with a high near 78.
Sunday Night
Partly cloudy, with a low around 60.
Monday
Mostly sunny, with a high near 82.
Monday Night
Partly cloudy, with a low around 64.
Tuesday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 67. Chance of precipitation is 70%.
Wednesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Florissant MO
 38.78°N 90.34°W (Elev. 528 ft)
Last Update:
2:26 pm CDT Sep 23, 2026
Forecast Valid:
4pm CDT Sep 23, 2026-6pm CDT Sep 30, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation