Island Park Reservoir Weather Forecast

    • 30
    • 50

    Rain Showers

    • 30
    • 49

    Rain/Snow Likely

    • 26
    • 53

    Partly Sunny

    • 26
    • 54

    Partly Sunny

    • 26
    • 56

    Mostly Sunny

    • 28
    • 59

    Mostly Sunny

Today 11 Oct Centennial Mountains/Island Park

Rain Showers. Highs 47 to 54.

Tonight 11 Oct Centennial Mountains/Island Park

Rain Showers and isolated snow Showers. Colder. Snow accumulation of 1 to 3 Inches. Lows 26 to 36.

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  • Temperature Real-Time

Island Park Reservoir Temperature Statistics

October Temperature

West Yellowstone (27.3 miles)

  • Lowest 4 October, 2026

    24.8 °F

  • Average October

    48.3 °F

  • Highest 5 October, 2026

    75.2 °F

Climate (2021–2026)

West Yellowstone (27.3 miles)

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  • Average Low 2021–2026

    33.9 °F

  • Average 2021–2026

    50.8 °F

  • Average High 2021–2026

    66 °F
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