Island Park Reservoir Weather Forecast

    • 48
    • 76

    Chance Thunderstorms

    • 47
    • 78

    Mostly Sunny

    • 49
    • 80

    Mostly Sunny

    • 49
    • 81

    Mostly Sunny

    • 48
    • 82

    Mostly Sunny

    • 49
    • 82

    Mostly Sunny

Today 22 Jul Centennial Mountains/Island Park

Mostly sunny. A slight chance of rain Showers in the morning. Then a slight chance of Showers and Thunderstorms in the afternoon. Some Thunderstorms may produce gusty Winds in the afternoon. Highs 73 to 82.

Tonight 22 Jul Centennial Mountains/Island Park

Partly cloudy. A slight chance of Showers and Thunderstorms in the evening. Some Thunderstorms may produce gusty Winds in the evening. Lows 47 to 57.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Island Park Reservoir Temperature Statistics

July Temperature

West Yellowstone (27.3 miles)

  • Lowest 6 July, 2025

    33.8 °F

  • Average July

    60.6 °F

  • Highest 1 July, 2025

    86 °F

Climate (2020–Present)

West Yellowstone (27.3 miles)

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  • Average Low 2020–2025

    33.4 °F

  • Average 2020–2025

    50.7 °F

  • Average High 2020–2025

    66.1 °F
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