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.

Light Rain

71°F

22°C

Humidity 94%
Wind Speed S 16 mph
Barometer 29.94 in (1012.8 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 19 Aug 7:51 am CDT
Extended Forecast for

Cool Valley MO

  • Today

    Today: Showers likely and possibly a thunderstorm before 9am, then scattered showers and thunderstorms, mainly between 9am and 1pm.  Cloudy, with a high near 81. South wind 3 to 5 mph.  Chance of precipitation is 70%.

    High: 81 °F

    Showers
    Likely then
    Scattered
    Showers

  • Tonight

    Tonight: Scattered showers and thunderstorms, mainly before 11pm.  Mostly cloudy, with a low around 69. Northeast wind around 5 mph becoming calm  in the evening.  Chance of precipitation is 30%.

    Low: 69 °F

    Scattered
    T-storms

  • Thursday

    Thursday: Mostly sunny, with a high near 84. Northeast wind 3 to 6 mph.

    High: 84 °F

    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 87. Calm wind becoming west around 5 mph in the afternoon.

    High: 87 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 70.

    Low: 70 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms before 1pm.  Mostly sunny, with a high near 87.

    High: 87 °F

    Slight Chance
    T-storms

  • 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

Today
Showers likely and possibly a thunderstorm before 9am, then scattered showers and thunderstorms, mainly between 9am and 1pm. Cloudy, with a high near 81. South wind 3 to 5 mph. Chance of precipitation is 70%.
Tonight
Scattered showers and thunderstorms, mainly before 11pm. Mostly cloudy, with a low around 69. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Thursday
Mostly sunny, with a high near 84. 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 87. Calm wind becoming west around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 70.
Saturday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 87.
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 85.
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:
Cool Valley MO
 38.73°N 90.31°W (Elev. 584 ft)
8:11 am CDT Aug 19, 2026
8am CDT Aug 19, 2026-6pm CDT Aug 25, 2026
 
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Additional Resources

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