Island Park Reservoir Weather Forecast

    • 50
    • 78

    Rain Showers Likely

    • 46
    • 71

    Rain Showers

    • 42
    • 72

    Chance Thunderstorms

    • 46
    • 75

    Mostly Sunny

    • 50
    • 81

    Mostly Sunny

    • 50
    • 84

    Partly Sunny

    • 50
    • 85

    Mostly Sunny

Today 3 Jul Centennial Mountains/Island Park

Partly sunny. A slight chance of rain Showers in the morning. Then a chance of rain Showers and a slight chance of Thunderstorms in the afternoon. Some Thunderstorms may produce gusty Winds in the afternoon. Highs 76 to 85.

Tonight 3 Jul Centennial Mountains/Island Park

Mostly cloudy. A chance of Showers and Thunderstorms in the evening. Lows 48 to 58.

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Island Park Reservoir Temperature Statistics

July Temperature

West Yellowstone (27.3 miles)

  • Lowest 1 July, 2025

    37.4 °F

  • Average July

    62.9 °F

  • Highest 1 July, 2025

    86 °F

Climate (2020–Present)

West Yellowstone (27.3 miles)

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  • Average Low 2020–2025

    33.3 °F

  • Average 2020–2025

    50.6 °F

  • Average High 2020–2025

    66 °F
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