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

Heat Builds in the West; Extremely Critical Fire Weather in the Northwest

A heat wave over the Southwest will intensify this week, peaking and expanding into the Intermountain West and northern High Plains this weekend. Critical to extremely critical fire weather conditions are forecast from the Northwest and the northern Great Basin this weekend. Particularly Dangerous Situation Red Flag Warnings have been issued. Read More >

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Mostly Cloudy

73°F

23°C

Humidity 74%
Wind Speed NW 14 mph
Barometer 29.87 in (1010.5 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 2 Aug 10:51 am CDT
Extended Forecast for

Florissant MO

  • Today

    Today: Mostly sunny, with a high near 82. North wind around 11 mph, with gusts as high as 21 mph.

    High: 82 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 66. North wind 5 to 8 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 85. Calm wind becoming northeast around 5 mph.

    High: 85 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 67. Light east wind.

    Low: 67 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 88. Light southeast wind.

    High: 88 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72.

    Low: 72 °F

    Partly Cloudy
    then Chance
    T-storms

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before 1pm. Partly sunny, with a high near 87. Chance of precipitation is 60%.

    High: 87 °F

    Showers
    Likely

Detailed Forecast

Today
Mostly sunny, with a high near 82. North wind around 11 mph, with gusts as high as 21 mph.
Tonight
Mostly clear, with a low around 66. North wind 5 to 8 mph becoming calm in the evening.
Monday
Sunny, with a high near 85. Calm wind becoming northeast around 5 mph.
Monday Night
Mostly clear, with a low around 67. Light east wind.
Tuesday
Sunny, with a high near 88. Light southeast wind.
Tuesday Night
Mostly clear, with a low around 69.
Wednesday
Sunny, with a high near 90.
Wednesday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72.
Thursday
Showers likely and possibly a thunderstorm before 1pm. Partly sunny, with a high near 87. Chance of precipitation is 60%.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 72.
Friday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.
Friday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
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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:
11:11 am CDT Aug 2, 2026
Forecast Valid:
11am CDT Aug 2, 2026-6pm CDT Aug 8, 2026
 
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