Island Park Weather Forecast

    • 45
    • 79

    Increasing Clouds

    • 40
    • 76

    Rain Showers Likely

    • 43
    • 74

    Partly Sunny

    • 40
    • 72

    Chance Rain Showers

    • 40
    • 71

    Chance Rain Showers

    • 39
    • 69

    Rain Showers Likely

    • 37
    • 60

    Rain Showers Likely

Today 6 Sep Centennial Mountains/Island Park

Sunny. Areas of smoke through the day. Highs 74 to 81.

Tonight 6 Sep Centennial Mountains/Island Park

Mostly cloudy. A slight chance of Showers and Thunderstorms in the evening. Then a slight chance of rain Showers after midnight. Areas of smoke through the night. Lows 45 to 55.

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Island Park Temperature Statistics

September Temperature

West Yellowstone (21.7 miles)

  • Lowest 1 September, 2025

    33.8 °F

  • Average September

    57.2 °F

  • Highest 3 September, 2025

    82.4 °F

Climate (2020–Present)

West Yellowstone (21.7 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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