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National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
7-Day Forecast 38.56°N 90.32°W (Text-Only)
NWS Forecast for: Affton MO
Issued by: National Weather Service Saint Louis, MO
Last Update: 4:46 pm CDT Jun 29, 2026		Print

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 77. South wind 5 to 9 mph.

    Low: 77 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Sunny and hot, with a high near 98. Heat index values as high as 107. Southwest wind 3 to 7 mph.

    High: 98 °F

    Hot


  • Tuesday
    Night

    Tuesday Night: Mostly clear, with a low around 77. South wind 3 to 6 mph.

    Low: 77 °F

    Mostly Clear


  • Wednesday

    Wednesday: Sunny and hot, with a high near 98. Heat index values as high as 107. South wind 3 to 7 mph.

    High: 98 °F

    Hot


  • Wednesday
    Night

    Wednesday Night: Mostly clear, with a low around 78. South wind 3 to 7 mph.

    Low: 78 °F

    Mostly Clear


  • Thursday

    Thursday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot


  • Thursday
    Night

    Thursday Night: Mostly clear, with a low around 78.

    Low: 78 °F

    Mostly Clear


  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 95.

    High: 95 °F

    Sunny then
    Chance
    T-storms

  • Friday
    Night

    Friday Night: Partly cloudy, with a low around 77.

    Low: 77 °F

    Partly Cloudy




    • Tonight: Mostly cloudy, then gradually becoming clear, with a low around 77. South wind 5 to 9 mph.

    Tuesday: Sunny and hot, with a high near 98. Heat index values as high as 107. Southwest wind 3 to 7 mph.

    Tuesday Night: Mostly clear, with a low around 77. South wind 3 to 6 mph.

    Wednesday: Sunny and hot, with a high near 98. Heat index values as high as 107. South wind 3 to 7 mph.

    Wednesday Night: Mostly clear, with a low around 78. South wind 3 to 7 mph.

    Thursday: Sunny and hot, with a high near 97.

    Thursday Night: Mostly clear, with a low around 78.

    Friday: A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 95.

    Friday Night: Partly cloudy, with a low around 77.

    Independence Day: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 95.

    Saturday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.

    Sunday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.

    Sunday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.

    Monday: A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.


    Affton MO
     38.56°N 90.32°W (Elev. 564 ft)

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