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National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
7-Day Forecast 40.16°N 105.09°W (Text-Only)
NWS Forecast for: Longmont CO
Issued by: National Weather Service Denver-Boulder, CO
Last Update: 2:21 pm MST Dec 4, 2025		Print

  • Overnight

    Overnight: Mostly cloudy, with a low around 18. West southwest wind 6 to 9 mph becoming northwest. Winds could gust as high as 15 mph.

    Low: 18 °F

    Mostly Cloudy




  • Friday

    Friday: Mostly sunny, with a high near 35. West wind around 6 mph becoming east in the afternoon.

    High: 35 °F

    Mostly Sunny




  • Friday
    Night

    Friday Night: A 20 percent chance of snow showers after 11pm. Partly cloudy, with a low around 20. West southwest wind 5 to 7 mph, with gusts as high as 15 mph.

    Low: 20 °F

    Slight Chance
    Snow Showers



  • Saturday

    Saturday: A chance of snow showers before 8am, then a chance of rain and snow showers between 8am and 11am, then a slight chance of rain showers after 11am. Partly sunny, with a high near 46. West northwest wind 9 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.

    High: 46 °F

    Chance
    Rain/Snow
    then Slight
    Chance
    Showers

  • Saturday
    Night

    Saturday Night: Partly cloudy, with a low around 22. West wind 6 to 9 mph.

    Low: 22 °F

    Partly Cloudy




  • Sunday

    Sunday: Sunny, with a high near 42.

    High: 42 °F

    Sunny




  • Sunday
    Night

    Sunday Night: Partly cloudy, with a low around 22.

    Low: 22 °F

    Partly Cloudy




  • Monday

    Monday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny




  • Monday
    Night

    Monday Night: Partly cloudy, with a low around 27.

    Low: 27 °F

    Partly Cloudy






    • Overnight: Mostly cloudy, with a low around 18. West southwest wind 6 to 9 mph becoming northwest. Winds could gust as high as 15 mph.

    Friday: Mostly sunny, with a high near 35. West wind around 6 mph becoming east in the afternoon.

    Friday Night: A 20 percent chance of snow showers after 11pm. Partly cloudy, with a low around 20. West southwest wind 5 to 7 mph, with gusts as high as 15 mph.

    Saturday: A chance of snow showers before 8am, then a chance of rain and snow showers between 8am and 11am, then a slight chance of rain showers after 11am. Partly sunny, with a high near 46. West northwest wind 9 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.

    Saturday Night: Partly cloudy, with a low around 22. West wind 6 to 9 mph.

    Sunday: Sunny, with a high near 42.

    Sunday Night: Partly cloudy, with a low around 22.

    Monday: Mostly sunny, with a high near 48.

    Monday Night: Partly cloudy, with a low around 27.

    Tuesday: Partly sunny, with a high near 53.

    Tuesday Night: A slight chance of showers. Mostly cloudy, with a low around 35.

    Wednesday: A chance of rain and snow showers. Partly sunny, with a high near 52.

    Wednesday Night: A slight chance of rain and snow showers. Mostly cloudy, with a low around 32.

    Thursday: A slight chance of rain and snow showers. Mostly sunny, with a high near 53.


    Longmont CO
     40.16°N 105.09°W (Elev. 4980 ft)

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