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

Severe Thunderstorms in the Midwest and Arizona; Heat Continues in the Southeast and Southwest

Thunderstorms, some severe, may lead to scattered instances of flash flooding across the Midwest and Ohio Valley and southern Arizona. The threat will shift to the Mid-Atlantic coast on Thursday. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that 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.

A Few Clouds

74°F

23°C

Humidity 94%
Wind Speed NW 5 mph
Barometer 29.91 in (1011.7 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 20 Aug 2:51 am CDT
Extended Forecast for

2 Miles ESE Saint Louis MO

  • Overnight

    Overnight: Patchy fog after 4am. Otherwise, partly cloudy, with a low around 70. Calm wind.

    Low: 70 °F

    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 8am. Otherwise, partly sunny, with a high near 83. Calm wind becoming northeast 5 to 7 mph in the morning.

    High: 83 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Patchy fog after 4am. Otherwise, mostly clear, with a low around 68. Northeast wind around 6 mph becoming calm in the evening.

    Low: 68 °F

    Mostly Clear
    then Patchy
    Fog

  • Friday

    Friday: Patchy fog before 8am. Otherwise, sunny, with a high near 88. Light and variable wind.

    High: 88 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 70. Light southwest wind.

    Low: 70 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Saturday

    Saturday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Saturday Night

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

    Low: 68 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 67.

    Low: 67 °F

    Slight Chance
    Showers

Detailed Forecast

Overnight
Patchy fog after 4am. Otherwise, partly cloudy, with a low around 70. Calm wind.
Thursday
Patchy fog before 8am. Otherwise, partly sunny, with a high near 83. Calm wind becoming northeast 5 to 7 mph in the morning.
Thursday Night
Patchy fog after 4am. Otherwise, mostly clear, with a low around 68. Northeast wind around 6 mph becoming calm in the evening.
Friday
Patchy fog before 8am. Otherwise, sunny, with a high near 88. Light and variable wind.
Friday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 70. Light southwest wind.
Saturday
Sunny, with a high near 86.
Saturday Night
Mostly clear, with a low around 68.
Sunday
Mostly sunny, with a high near 85.
Sunday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 67.
Monday
Partly sunny, with a high near 85.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Tuesday
Mostly sunny, with a high near 88.
Tuesday Night
Partly cloudy, with a low around 70.
Wednesday
Mostly sunny, with a high near 90.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ESE Saint Louis MO
 38.62°N 90.2°W (Elev. 446 ft)
Last Update:
1:20 am CDT Aug 20, 2026
Forecast Valid:
3am CDT Aug 20, 2026-6pm CDT Aug 26, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation