Granite Bay State Marine Park Weather Forecast

    • 24
    • 26

    Sunny

    • 25
    • 25

    Mostly Sunny

    • 8
    • 28

    Mostly Sunny

    • 12
    • 16

    Mostly Sunny

    • 17
    • 22

    Partly Sunny

    • 15
    • 23

    Mostly Cloudy

Today 19 Dec West Prince William Sound & Whittier

Sunny. Highs in the upper teens to lower 30s. Northwest wind 10 to 20 Mph with Gusts to 30 Mph.

Tonight 19 Dec West Prince William Sound & Whittier

Clear. Lows 19 to 29. Northwest wind 10 to 20 Mph.

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Granite Bay State Marine Park Temperature Statistics

December Temperature

Portage, Portage Glacier (25.5 miles)

  • Lowest 11 December, 2025

    -6 °F

  • Average December

    15.9 °F

  • Highest 2 December, 2025

    41 °F

Climate (2021–Present)

Portage, Portage Glacier (25.5 miles)

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  • Average Low 2021–2025

    33.3 °F

  • Average 2021–2025

    39.1 °F

  • Average High 2021–2025

    44.6 °F
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