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National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
7-Day Forecast 38.42°N 90.38°W (Text-Only)
NWS Forecast for: Arnold MO
Issued by: National Weather Service Saint Louis, MO
Last Update: 8:26 pm CST Dec 4, 2025		Print

  • Overnight

    Overnight: Clear, with a low around 14. Calm wind.

    Low: 14 °F

    Clear


  • Friday

    Friday: Sunny, with a high near 42. Calm wind becoming south around 6 mph in the afternoon.

    High: 42 °F

    Sunny


  • Friday
    Night

    Friday Night: Increasing clouds, with a low around 27. South wind around 6 mph becoming calm after midnight.

    Low: 27 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Partly sunny, with a high near 40. Light and variable wind.

    High: 40 °F

    Partly Sunny


  • Saturday
    Night

    Saturday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 29. Light east wind.

    Low: 29 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Sunday

    Sunday: A slight chance of rain and snow. Mostly cloudy, with a high near 39. Chance of precipitation is 20%.

    High: 39 °F

    Slight Chance
    Rain/Snow

  • Sunday
    Night

    Sunday Night: Mostly cloudy, with a low around 17.

    Low: 17 °F

    Mostly Cloudy


  • Monday

    Monday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny


  • Monday
    Night

    Monday Night: Partly cloudy, with a low around 24.

    Low: 24 °F

    Partly Cloudy


    • Overnight: Clear, with a low around 14. Calm wind.

    Friday: Sunny, with a high near 42. Calm wind becoming south around 6 mph in the afternoon.

    Friday Night: Increasing clouds, with a low around 27. South wind around 6 mph becoming calm after midnight.

    Saturday: Partly sunny, with a high near 40. Light and variable wind.

    Saturday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 29. Light east wind.

    Sunday: A slight chance of rain and snow. Mostly cloudy, with a high near 39. Chance of precipitation is 20%.

    Sunday Night: Mostly cloudy, with a low around 17.

    Monday: Mostly sunny, with a high near 33.

    Monday Night: Partly cloudy, with a low around 24.

    Tuesday: Mostly sunny, with a high near 47.

    Tuesday Night: Mostly cloudy, with a low around 34.

    Wednesday: A 30 percent chance of rain. Mostly cloudy, with a high near 49.

    Wednesday Night: Mostly cloudy, with a low around 24.

    Thursday: Partly sunny, with a high near 36.


    Arnold MO
     38.42°N 90.38°W (Elev. 495 ft)

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