Island Park Reservoir Weather Forecast

    • 38
    • 69

    Increasing Clouds

    • 37
    • 75

    Partly Sunny

    • 43
    • 79

    Mostly Sunny

    • 44
    • 81

    Slight Chance Thunderstorms

    • 39
    • 70

    Slight Chance Thunderstorms

    • 35
    • 66

    Partly Sunny

    • 32
    • 61

    Partly Sunny

Today 10 May Centennial Mountains/Island Park

Sunny, warmer. Highs 68 to 76.

Tonight 10 May Centennial Mountains/Island Park

Partly cloudy. Lows 38 to 48.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Island Park Reservoir Temperature Statistics

May Temperature

West Yellowstone (27.3 miles)

  • Lowest 6 May, 2026

    14 °F

  • Average May

    44.5 °F

  • Highest 7 May, 2026

    64.4 °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

    66.3 °F
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