Island Park Reservoir Weather Forecast

    • 33
    • 59

    Partly Sunny

    • 38
    • 67

    Partly Sunny

    • 39
    • 72

    Partly Sunny

    • 41
    • 74

    Partly Sunny

    • 37
    • 66

    Chance Rain

    • 36
    • 62

    Chance Rain Showers

Today 22 May Centennial Mountains/Island Park

Mostly sunny. Highs 57 to 65.

Tonight 22 May Centennial Mountains/Island Park

Mostly cloudy in the evening then clearing. 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 19 May, 2026

    12.2 °F

  • Average May

    45.6 °F

  • Highest 13 May, 2026

    77 °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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