Island Park Reservoir Weather Forecast

    • 53
    • 83

    Partly Cloudy

    • 54
    • 85

    Chance Rain

    • 51
    • 77

    Chance Thunderstorms

    • 48
    • 75

    Chance Thunderstorms

    • 48
    • 74

    Chance Rain Showers

    • 48
    • 75

    Slight Chance Thunderstorms

Today 20 Aug Centennial Mountains/Island Park

Sunny. Highs 82 to 90.

Tonight 20 Aug Centennial Mountains/Island Park

Partly cloudy. Lows 53 to 63.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Island Park Reservoir Temperature Statistics

August Temperature

West Yellowstone (27.3 miles)

  • Lowest 4 August, 2026

    30.2 °F

  • Average August

    59.9 °F

  • Highest 1 August, 2026

    91.4 °F

Climate (2021–2026)

West Yellowstone (27.3 miles)

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  • Average Low 2021–2026

    33.7 °F

  • Average 2021–2026

    50.7 °F

  • Average High 2021–2026

    65.9 °F
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