Granite Bay State Marine Park Weather Forecast

    • 30
    • 41

    Slight Chance Rain Showers

    • 30
    • 37

    Mostly Sunny

    • 35
    • 37

    Chance Rain

    • 36
    • 41

    Rain

    • 36
    • 41

    Rain

    • 36
    • 43

    Slight Chance Rain

    • 38
    • 44

    Mostly Cloudy

Today 21 Oct West Prince William Sound & Whittier

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

Tonight 21 Oct West Prince William Sound & Whittier

Mostly cloudy. Lows in the lower to mid 30s. North wind 10 to 25 Mph with Gusts to 40 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Granite Bay State Marine Park Temperature Statistics

October Temperature

Portage, Portage Glacier (25.5 miles)

  • Lowest 18 October, 2026

    28.9 °F

  • Average October

    40.9 °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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