Deep Lake Weather Forecast

    • 9
    • 21

    Mostly Cloudy

    • -3
    • 16

    Mostly Cloudy

    • -4
    • 4

    Cold

    • 3
    • 11

    Partly Sunny

    • 8
    • 16

    Partly Sunny

    • 13
    • 22

    Partly Sunny

    • 15
    • 26

    Partly Sunny

Today 21 Jan Gallatin and Madison County Mountains and Centennial Mountains

Mostly sunny. Highs 21 to 29. West Winds up to 10 Mph.

Tonight 21 Jan Gallatin and Madison County Mountains and Centennial Mountains

Partly cloudy in the late evening and early morning then becoming mostly cloudy. Lows 3 to 11. West Winds up to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Deep Lake Temperature Statistics

January Temperature

Ennis - Big Sky Airport (28 miles)

  • Lowest 19 January, 2026

    10.4 °F

  • Average January

    33.4 °F

  • Highest 13 January, 2026

    53.6 °F

Climate (2021–Present)

Ennis - Big Sky Airport (28 miles)

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  • Average Low 2021–2026

    31.8 °F

  • Average 2021–2026

    44.1 °F

  • Average High 2021–2026

    56 °F
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