Granite Bay State Marine Park Weather Forecast

    • 41
    • 45

    Rain Showers

    • 40
    • 45

    Chance Rain Showers

    • 36
    • 44

    Chance Rain Showers

    • 39
    • 42

    Mostly Cloudy

    • 38
    • 46

    Rain Likely

    • 39
    • 43

    Rain

    • 38
    • 44

    Rain

Today 16 Oct West Prince William Sound & Whittier

Rain Showers. Highs in the mid 40s. Northeast wind 15 Mph.

Tonight 16 Oct West Prince William Sound & Whittier

Rain Showers likely in the Evening, then a chance of rain Showers after midnight. Lows in the lower 40s. Northwest wind 15 Mph.

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  • Temperature Real-Time

Granite Bay State Marine Park Temperature Statistics

October Temperature

Portage, Portage Glacier (25.5 miles)

  • Lowest 10 October, 2025

    30.9 °F

  • Average October

    44.7 °F

  • Highest 5 October, 2025

    53.1 °F

Climate (2020–Present)

Portage, Portage Glacier (25.5 miles)

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  • Average Low 2020–2025

    33.6 °F

  • Average 2020–2025

    39.4 °F

  • Average High 2020–2025

    45 °F
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