Granite Bay State Marine Park Weather Forecast

    • 53
    • 62

    Partly Sunny

    • 52
    • 67

    Partly Sunny

    • 52
    • 66

    Partly Sunny

    • 52
    • 64

    Mostly Cloudy

    • 53
    • 66

    Mostly Cloudy

    • 53
    • 64

    Chance Rain

    • 52
    • 63

    Chance Rain

Today 6 Aug West Prince William Sound & Whittier

Mostly cloudy in the morning then becoming partly cloudy. Highs in the upper 50s. Variable wind 10 Mph.

Tonight 6 Aug West Prince William Sound & Whittier

Partly cloudy. Lows in the lower 50s. Southwest wind 15 Mph. Gusts to 25 Mph after midnight.

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Granite Bay State Marine Park Temperature Statistics

August Temperature

Portage, Portage Glacier (25.5 miles)

  • Lowest 1 August, 2026

    46 °F

  • Average August

    56.7 °F

  • Highest 1 August, 2026

    73 °F

Climate (2021–2026)

Portage, Portage Glacier (25.5 miles)

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  • Average Low 2021–2026

    32.2 °F

  • Average 2021–2026

    38.1 °F

  • Average High 2021–2026

    43.7 °F
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