Swan Lake Weather Forecast

    • 44
    • 85

    Chance Thunderstorms

    • 43
    • 78

    Chance Thunderstorms

    • 44
    • 81

    Mostly Sunny

    • 46
    • 85

    Mostly Sunny

    • 44
    • 85

    Mostly Sunny

    • 42
    • 83

    Mostly Sunny

    • 42
    • 82

    Mostly Sunny

Today 16 Aug Gallatin and Madison County Mountains and Centennial Mountains

Haze in the morning. Partly cloudy in the Morning, then mostly cloudy with a 20 percent chance of Thunderstorms in the afternoon. Highs 70 to 80. South Winds 5 to 15 Mph. Gusts up to 30 Mph in the afternoon.

Tonight 16 Aug Gallatin and Madison County Mountains and Centennial Mountains

Cooler. Mostly cloudy with a 40 percent chance of Thunderstorms in the Evening, then partly cloudy after midnight. Lows 45 to 55. South Winds 5 to 15 Mph.

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Swan Lake Temperature Statistics

August Temperature

West Yellowstone (29.8 miles)

  • Lowest 10 August, 2025

    32 °F

  • Average August

    60.8 °F

  • Highest 6 August, 2025

    84.2 °F

Climate (2020–Present)

West Yellowstone (29.8 miles)

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  • Average Low 2020–2025

    33.3 °F

  • Average 2020–2025

    50.7 °F

  • Average High 2020–2025

    66.1 °F
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