Harriman State Park Weather Forecast

    • 14
    • 38

    Chance Snow Showers

    • 20
    • 46

    Mostly Sunny

    • 29
    • 59

    Partly Sunny

    • 35
    • 65

    Partly Sunny

    • 37
    • 67

    Partly Sunny

    • 31
    • 57

    Rain Likely

Today 17 Apr Centennial Mountains/Island Park

Mostly sunny. A slight chance of snow Showers in the morning. Then a chance of snow Showers in the afternoon. Snow accumulation of 1 to 3 Inches. Highs 33 to 41.

Tonight 17 Apr Centennial Mountains/Island Park

Mostly clear. A slight chance of snow Showers in the evening. Lows 14 to 24.

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Harriman State Park Temperature Statistics

April Temperature

West Yellowstone (28.6 miles)

  • Lowest 15 April, 2026

    32 °F

  • Average April

    35.2 °F

  • Highest 15 April, 2026

    39.2 °F

Climate (2021–Present)

West Yellowstone (28.6 miles)

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  • Average Low 2021–2026

    34 °F

  • Average 2021–2026

    51.2 °F

  • Average High 2021–2026

    66.6 °F
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