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National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
7-Day Forecast 38.61°N 90.54°W (Text-Only)
NWS Forecast for: Ballwin MO
Issued by: National Weather Service Saint Louis, MO
Last Update: 2:21 am CDT Jun 30, 2026		Print

  • Today

    Today: Sunny and hot, with a high near 97. Heat index values as high as 106. Southwest wind 5 to 7 mph.

    High: 97 °F

    Hot



  • Tonight

    Tonight: Clear, with a low around 77. South wind around 6 mph.

    Low: 77 °F

    Clear



  • Wednesday

    Wednesday: Sunny and hot, with a high near 97. Heat index values as high as 105. Southwest wind around 6 mph.

    High: 97 °F

    Hot



  • Wednesday
    Night

    Wednesday Night: Clear, with a low around 77. South wind 3 to 6 mph.

    Low: 77 °F

    Clear



  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 96. Southwest wind 3 to 5 mph.

    High: 96 °F

    Sunny then
    Slight Chance
    T-storms

  • Thursday
    Night

    Thursday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 76. Chance of precipitation is 20%.

    Low: 76 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 96.

    High: 96 °F

    Sunny then
    Slight Chance
    T-storms

  • Friday
    Night

    Friday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.

    Low: 75 °F

    Slight Chance
    T-storms


  • Independence
    Day

    Independence Day: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 95.

    High: 95 °F

    Chance
    T-storms




    • Today: Sunny and hot, with a high near 97. Heat index values as high as 106. Southwest wind 5 to 7 mph.

    Tonight: Clear, with a low around 77. South wind around 6 mph.

    Wednesday: Sunny and hot, with a high near 97. Heat index values as high as 105. Southwest wind around 6 mph.

    Wednesday Night: Clear, with a low around 77. South wind 3 to 6 mph.

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 96. Southwest wind 3 to 5 mph.

    Thursday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 76. Chance of precipitation is 20%.

    Friday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 96.

    Friday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.

    Independence Day: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 95.

    Saturday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.

    Sunday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.

    Sunday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.

    Monday: A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.


    Ballwin MO
     38.61°N 90.54°W (Elev. 597 ft)

    Visit your local NWS office at: https://www.weather.gov/lsx/