Granite Bay State Marine Park Weather Forecast

    • 30
    • 37

    Sunny

    • 35
    • 37

    Mostly Cloudy

    • 36
    • 41

    Rain

    • 36
    • 42

    Rain

    • 37
    • 43

    Chance Rain

    • 38
    • 45

    Partly Sunny

    • 37
    • 43

    Chance Rain

Today 22 Oct West Prince William Sound & Whittier

Mostly cloudy with a chance of rain and a slight chance of snow. Lows in the upper 30s. Highs in the mid 40s.

Tonight 22 Oct West Prince William Sound & Whittier

Clear. Lows in the upper 20s to mid 30s. North wind 10 to 15 Mph. Gusts to 25 Mph in the evening.

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Granite Bay State Marine Park Temperature Statistics

October Temperature

Portage, Portage Glacier (25.5 miles)

  • Lowest 18 October, 2026

    28.9 °F

  • Average October

    40.7 °F

  • Highest 15 October, 2026

    50 °F

Climate (2021–2026)

Portage, Portage Glacier (25.5 miles)

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  • Average Low 2021–2026

    32.3 °F

  • Average 2021–2026

    38.3 °F

  • Average High 2021–2026

    43.9 °F
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