Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Mostly Cloudy

78°F

26°C

Humidity 76%
Wind Speed SW 6 mph
Barometer 29.95 in (1013.2 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 19 Aug 11:51 am CDT
Extended Forecast for

3 Miles NNW Florissant MO

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms.  Mostly cloudy, with a high near 82. South wind around 5 mph becoming northwest.

    High: 82 °F

    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 3am.  Patchy fog after 5am.  Otherwise, mostly cloudy, with a low around 70. Northeast wind around 5 mph becoming calm  in the evening.  Chance of precipitation is 30%.

    Low: 70 °F

    Chance
    T-storms and
    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 8am.  Otherwise, partly sunny, with a high near 85. Northeast wind 3 to 6 mph.

    High: 85 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 68. Northeast wind around 5 mph becoming calm  in the evening.

    Low: 68 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 88. Calm wind becoming west around 5 mph in the afternoon.

    High: 88 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms after 1am.  Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers before 1pm.  Sunny, with a high near 86.

    High: 86 °F

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82. South wind around 5 mph becoming northwest.
Tonight
A chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 3am. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 70. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Thursday
Patchy fog before 8am. Otherwise, partly sunny, with a high near 85. Northeast wind 3 to 6 mph.
Thursday Night
Mostly clear, with a low around 68. Northeast wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 88. Calm wind becoming west around 5 mph in the afternoon.
Friday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 69.
Saturday
A 20 percent chance of showers before 1pm. Sunny, with a high near 86.
Saturday Night
Mostly clear, with a low around 68.
Sunday
Mostly sunny, with a high near 84.
Sunday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 67.
Monday
Partly sunny, with a high near 84.
Monday Night
Partly cloudy, with a low around 69.
Tuesday
Mostly sunny, with a high near 88.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Florissant MO
 38.82°N 90.34°W (Elev. 551 ft)
11:26 am CDT Aug 19, 2026
12pm CDT Aug 19, 2026-6pm CDT Aug 25, 2026
 
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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