Thunderstorms and Heavy Rains in the Appalachians

Multiple rounds of moderate to locally heavy rain will impact portions of the Appalachians and Mid-Atlantic, which may lead to flash flooding concerns. Thunderstorms with isolated severe wind gusts will be possible this afternoon from parts of the Southeast into the southern and central Appalachians. A multi-day heavy rain will pose a flash flood threat in New Mexico beginning Tuesday. Read More >

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

A Few Clouds

70°F

21°C

Humidity 93%
Wind Speed N 8 mph
Barometer 29.96 in (1013.1 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 21 Sep 5:51 am CDT
Extended Forecast for

Saint Louis MO

  • Today

    Today: A 40 percent chance of showers and thunderstorms, mainly before 1pm.  Patchy fog between 7am and 8am.  Otherwise, cloudy, with a high near 76. North wind 3 to 7 mph.

    High: 76 °F

    Chance
    Showers and
    Patchy Fog
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: Mostly cloudy, with a low around 63. Northeast wind 5 to 8 mph.

    Low: 63 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 74. Northeast wind 6 to 9 mph.

    High: 74 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy during the early evening, then becoming mostly clear, with a low around 57. Northeast wind 5 to 9 mph.

    Low: 57 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 75. North wind 6 to 8 mph.

    High: 75 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

Detailed Forecast

Today
A 40 percent chance of showers and thunderstorms, mainly before 1pm. Patchy fog between 7am and 8am. Otherwise, cloudy, with a high near 76. North wind 3 to 7 mph.
Tonight
Mostly cloudy, with a low around 63. Northeast wind 5 to 8 mph.
Tuesday
Mostly cloudy, with a high near 74. Northeast wind 6 to 9 mph.
Tuesday Night
Mostly cloudy during the early evening, then becoming mostly clear, with a low around 57. Northeast wind 5 to 9 mph.
Wednesday
Mostly sunny, with a high near 75. North wind 6 to 8 mph.
Wednesday Night
Partly cloudy, with a low around 57.
Thursday
Mostly sunny, with a high near 76.
Thursday Night
Partly cloudy, with a low around 58.
Friday
Mostly sunny, with a high near 77.
Friday Night
Partly cloudy, with a low around 58.
Saturday
A 20 percent chance of showers. Partly sunny, with a high near 76.
Saturday Night
Mostly cloudy, with a low around 59.
Sunday
Mostly sunny, with a high near 82.
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Louis MO
 38.64°N 90.23°W (Elev. 538 ft)
5:46 am CDT Sep 21, 2026
6am CDT Sep 21, 2026-6pm CDT Sep 27, 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