Granite Bay State Marine Park Weather Forecast

    • 50
    • 59

    Mostly Cloudy

    • 51
    • 58

    Rain

    • 47
    • 56

    Rain

    • 52
    • 62

    Mostly Cloudy

    • 50
    • 64

    Mostly Cloudy

    • 49
    • 58

    Rain Showers Likely

Today 6 Jul West Prince William Sound & Whittier

Mostly cloudy. A slight chance of rain in the morning. Highs in the upper 50s. North wind 15 Mph with Gusts to 25 Mph shifting to the southwest in the afternoon.

Tonight 6 Jul West Prince William Sound & Whittier

Mostly cloudy in the evening then becoming partly cloudy. Lows in the lower 50s. Southwest wind 15 Mph.

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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

    52.2 °F

  • Highest 1 July, 2026

    64 °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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