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National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
7-Day Forecast 38.78°N 90.57°W (Text-Only)
NWS Forecast for: Saint Peters 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 9. Light southeast wind.

    Low: 9 °F

    Clear



  • Friday

    Friday: Sunny, with a high near 38. South wind 3 to 7 mph.

    High: 38 °F

    Sunny



  • Friday
    Night

    Friday Night: Increasing clouds, with a low around 26. South wind 5 to 7 mph becoming west after midnight.

    Low: 26 °F

    Increasing
    Clouds


  • Saturday

    Saturday: Partly sunny, with a high near 35. Calm wind becoming east around 5 mph in the afternoon.

    High: 35 °F

    Partly Sunny



  • Saturday
    Night

    Saturday Night: A 30 percent chance of snow after midnight. Mostly cloudy, with a low around 29. East wind around 6 mph.

    Low: 29 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: A chance of rain and snow before noon, then a slight chance of snow. Mostly cloudy, with a high near 34. Chance of precipitation is 30%.

    High: 34 °F

    Chance
    Rain/Snow
    then Slight
    Chance Snow

  • Sunday
    Night

    Sunday Night: Mostly cloudy, with a low around 15.

    Low: 15 °F

    Mostly Cloudy



  • Monday

    Monday: Mostly sunny, with a high near 30.

    High: 30 °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 9. Light southeast wind.

    Friday: Sunny, with a high near 38. South wind 3 to 7 mph.

    Friday Night: Increasing clouds, with a low around 26. South wind 5 to 7 mph becoming west after midnight.

    Saturday: Partly sunny, with a high near 35. Calm wind becoming east around 5 mph in the afternoon.

    Saturday Night: A 30 percent chance of snow after midnight. Mostly cloudy, with a low around 29. East wind around 6 mph.

    Sunday: A chance of rain and snow before noon, then a slight chance of snow. Mostly cloudy, with a high near 34. Chance of precipitation is 30%.

    Sunday Night: Mostly cloudy, with a low around 15.

    Monday: Mostly sunny, with a high near 30.

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

    Tuesday: Mostly sunny, with a high near 43.

    Tuesday Night: Mostly cloudy, with a low around 33.

    Wednesday: A 30 percent chance of rain. Mostly cloudy, with a high near 45.

    Wednesday Night: Mostly cloudy, with a low around 23.

    Thursday: Partly sunny, with a high near 33.


    Saint Peters MO
     38.78°N 90.57°W (Elev. 535 ft)

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