Fan Mountain Weather Forecast

    • 38
    • 64

    Increasing Clouds

    • 32
    • 49

    Rain/Snow

    • 34
    • 53

    Mostly Sunny

    • 41
    • 61

    Partly Sunny

    • 42
    • 62

    Partly Sunny

    • 39
    • 59

    Chance Rain Showers

Today 6 Sep Gallatin and Madison County Mountains and Centennial Mountains

Sunny. Highs 64 to 74. South Winds 5 to 10 Mph with Gusts to around 30 Mph increasing to 10 to 20 Mph with Gusts to around 40 Mph in the afternoon.

Tonight 6 Sep Gallatin and Madison County Mountains and Centennial Mountains

Cloudy. Rain Showers likely and slight chance of Thunderstorms after midnight. Lows 40 to 46. South Winds 5 to 15 Mph with Gusts to around 35 Mph. Chance of precipitation 70 percent.

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Fan Mountain Temperature Statistics

September Temperature

Ennis - Big Sky Airport (6.2 miles)

  • Lowest 2 September, 2026

    50 °F

  • Average September

    63.8 °F

  • Highest 1 September, 2026

    78.8 °F

Climate (2021–2026)

Ennis - Big Sky Airport (6.2 miles)

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  • Average Low 2021–2026

    32.1 °F

  • Average 2021–2026

    44.5 °F

  • Average High 2021–2026

    56.4 °F
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