Granite Bay State Marine Park Weather Forecast

    • 52
    • 60

    Mostly Sunny

    • 52
    • 63

    Mostly Cloudy

    • 50
    • 55

    Rain

    • 50
    • 60

    Chance Rain Showers

    • 51
    • 64

    Partly Sunny

    • 52
    • 63

    Mostly Cloudy

Today 25 Jul West Prince William Sound & Whittier

Sunny. Highs in the lower to mid 60s. North wind 10 to 20 Mph.

Tonight 25 Jul West Prince William Sound & Whittier

Mostly clear. Lows in the lower 50s. Light Winds becoming variable 10 Mph after midnight.

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Granite Bay State Marine Park Temperature Statistics

July Temperature

Portage, Portage Glacier (25.5 miles)

  • Lowest 1 July, 2026

    34 °F

  • Average July

    52.1 °F

  • Highest 6 July, 2026

    68 °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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