Fan Mountain Weather Forecast

    • 39
    • 59

    Increasing Clouds

    • 40
    • 61

    Partly Sunny

    • 41
    • 62

    Mostly Sunny

    • 32
    • 56

    Chance Thunderstorms

    • 35
    • 52

    Sunny

    • 39
    • 60

    Mostly Sunny

Today 18 Sep Gallatin and Madison County Mountains and Centennial Mountains

Sunny. Highs 60 to 70. Southwest Winds up to 10 Mph.

Tonight 18 Sep Gallatin and Madison County Mountains and Centennial Mountains

Mostly clear. Lows 40 to 50. Northwest Winds up to 10 Mph shifting to the south after midnight.

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Fan Mountain Temperature Statistics

September Temperature

Ennis - Big Sky Airport (6.2 miles)

  • Lowest 5 September, 2025

    39.2 °F

  • Average September

    60.9 °F

  • Highest 2 September, 2025

    87.8 °F

Climate (2020–Present)

Ennis - Big Sky Airport (6.2 miles)

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  • Average Low 2020–2025

    31.3 °F

  • Average 2020–2025

    43.7 °F

  • Average High 2020–2025

    55.7 °F
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