Grassy Lake Weather Forecast

    • 25
    • 30

    Snow

    • 20
    • 29

    Chance Snow

    • 24
    • 29

    Mostly Cloudy

    • 30
    • 34

    Breezy

    • 31
    • 38

    Snow Likely

    • 30
    • 38

    Snow Likely

    • 29
    • 37

    Chance Snow

Today 5 Dec Gallatin and Madison County Mountains and Centennial Mountains

Partly sunny early in the Afternoon, then snow late in the afternoon. Snow may be heavy at Times late in the afternoon. New snow accumulation up to 3 Inches. Near steady temperature in the mid 20s. Southwest Winds 5 to 15 Mph with Gusts to around 30 Mph. Chance of snow near 100 percent.

Tonight 5 Dec Gallatin and Madison County Mountains and Centennial Mountains

Breezy. Snow early in the Evening, then chance of snow in the late evening and overnight. Patchy blowing snow. Snow may be heavy at Times early in the evening. Visibility one quarter mile or less at Times. Snow accumulation up to 11 Inches. Total snow accumulation up to 13 Inches. Lows 18 to 26. Southwest Winds 10 to 20 Mph with Gusts to around 50 Mph shifting to the west 15 to 25 Mph with Gusts to around 55 Mph after midnight. Chance of snow near 100 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Grassy Lake Temperature Statistics

December Temperature

Ennis - Big Sky Airport (11.2 miles)

  • Lowest 1 December, 2025

    5 °F

  • Average December

    26.6 °F

  • Highest 2 December, 2025

    33.8 °F

Climate (2020–Present)

Ennis - Big Sky Airport (11.2 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    31.5 °F

  • Average 2020–2025

    43.9 °F

  • Average High 2020–2025

    55.8 °F
Get WillyWeather+ to remove ads