Deep Lake Weather Forecast

    • 40
    • 56

    Becoming Sunny

    • 44
    • 62

    Mostly Sunny

    • 44
    • 63

    Partly Sunny

    • 44
    • 64

    Partly Sunny

    • 39
    • 60

    Mostly Sunny

    • 44
    • 60

    Mostly Sunny

Today 17 Sep Gallatin and Madison County Mountains and Centennial Mountains

Sunny. Highs 55 to 65. Northeast Winds up to 10 Mph.

Tonight 17 Sep Gallatin and Madison County Mountains and Centennial Mountains

Mostly clear. Lows 35 to 45. Northeast Winds up to 10 Mph shifting to the east after midnight.

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Deep Lake Temperature Statistics

September Temperature

Ennis - Big Sky Airport (28 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 (28 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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