Island Park Weather Forecast

    • 35
    • 69

    Increasing Clouds

    • 33
    • 68

    Partly Sunny

    • 38
    • 74

    Mostly Sunny

    • 38
    • 72

    Mostly Sunny

    • 35
    • 66

    Partly Sunny

    • 33
    • 67

    Mostly Cloudy

Today 22 Sep Centennial Mountains/Island Park

Increasing Clouds. Highs 62 to 70.

Tonight 22 Sep Centennial Mountains/Island Park

Mostly cloudy. A chance of rain Showers and a slight chance of Thunderstorms in the evening. Lows 36 to 46.

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Island Park Temperature Statistics

September Temperature

West Yellowstone (21.7 miles)

  • Lowest 15 September, 2026

    23 °F

  • Average September

    51.1 °F

  • Highest 6 September, 2026

    75.2 °F

Climate (2021–2026)

West Yellowstone (21.7 miles)

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  • Average Low 2021–2026

    33.9 °F

  • Average 2021–2026

    50.7 °F

  • Average High 2021–2026

    65.9 °F
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