Big Sky Weather Forecast

    • 18
    • 30

    Increasing Clouds

    • 22
    • 36

    Mostly Sunny

    • 24
    • 40

    Partly Sunny

    • 27
    • 37

    Mostly Cloudy

    • 27
    • 36

    Slight Chance Snow

    • 23
    • 36

    Chance Snow

Today 29 Dec Gallatin and Madison County Mountains and Centennial Mountains

Not as cold. Sunny. Highs 19 to 29. Southwest Winds 5 to 10 Mph with Gusts to around 25 Mph.

Tonight 29 Dec Gallatin and Madison County Mountains and Centennial Mountains

Partly cloudy. Near steady temperature around 15. Southwest Winds 5 to 10 Mph with Gusts to around 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Sky Temperature Statistics

December Temperature

Ennis - Big Sky Airport (13.7 miles)

  • Lowest 27 December, 2025

    3.2 °F

  • Average December

    38.4 °F

  • Highest 14 December, 2025

    60.8 °F

Climate (2020–Present)

Ennis - Big Sky Airport (13.7 miles)

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  • Average Low 2020–2025

    31.7 °F

  • Average 2020–2025

    44 °F

  • Average High 2020–2025

    55.9 °F
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