Island Park Reservoir Weather Forecast

    • 35
    • 62

    Decreasing Clouds

    • 35
    • 64

    Increasing Clouds

    • 34
    • 62

    Mostly Sunny

    • 39
    • 72

    Partly Sunny

    • 36
    • 74

    Mostly Sunny

    • 41
    • 76

    Mostly Sunny

    • 38
    • 75

    Partly Sunny

Today 7 May Centennial Mountains/Island Park

Partly sunny. Highs 60 to 69.

Tonight 7 May Centennial Mountains/Island Park

Mostly clear. Lows 32 to 42.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Island Park Reservoir Temperature Statistics

May Temperature

West Yellowstone (27.3 miles)

  • Lowest 1 May, 2026

    17.6 °F

  • Average May

    43.7 °F

  • Highest 2 May, 2026

    62.6 °F

Climate (2021–Present)

West Yellowstone (27.3 miles)

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  • Average Low 2021–2026

    33.8 °F

  • Average 2021–2026

    51 °F

  • Average High 2021–2026

    66.2 °F
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