Deep Lake Weather Forecast

    • 41
    • 57

    Chance Rain Showers

    • 42
    • 54

    Decreasing Clouds

    • 45
    • 60

    Mostly Sunny

    • 37
    • 60

    Slight Chance Rain

    • 35
    • 47

    Mostly Cloudy

    • 36
    • 49

    Chance Rain/Snow

    • 33
    • 45

    Chance Snow

Today 22 Sep Gallatin and Madison County Mountains and Centennial Mountains

Mostly sunny. Highs 48 to 58.

Tonight 22 Sep Gallatin and Madison County Mountains and Centennial Mountains

Mostly cloudy. Slight chance of Thunderstorms in the evening. Chance of rain Showers until early Morning, then slight chance of rain Showers late in the night. Lows 38 to 44. South Winds up to 10 Mph with Gusts to around 25 Mph. Chance of precipitation 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Deep Lake Temperature Statistics

September Temperature

Ennis - Big Sky Airport (28 miles)

  • Lowest 15 September, 2026

    30.2 °F

  • Average September

    57.7 °F

  • Highest 6 September, 2026

    82.4 °F

Climate (2021–2026)

Ennis - Big Sky Airport (28 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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