Granite Bay State Marine Park Weather Forecast

    • 53
    • 63

    Decreasing Clouds

    • 53
    • 64

    Mostly Sunny

    • 52
    • 64

    Partly Sunny

    • 52
    • 65

    Mostly Cloudy

    • 51
    • 59

    Rain Showers

    • 51
    • 59

    Rain Showers

Today 30 Jul West Prince William Sound & Whittier

Partly sunny. Highs in the mid 50s to lower 60s. Light Winds becoming variable 10 Mph in the afternoon.

Tonight 30 Jul West Prince William Sound & Whittier

Partly cloudy. Lows in the lower 50s. Variable wind 10 Mph.

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  • Temperature Real-Time

Granite Bay State Marine Park Temperature Statistics

July Temperature

Portage, Portage Glacier (25.5 miles)

  • Lowest 1 July, 2026

    34 °F

  • Average July

    53.1 °F

  • Highest 24 July, 2026

    71.1 °F

Climate (2021–2026)

Portage, Portage Glacier (25.5 miles)

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  • Average Low 2021–2026

    32.1 °F

  • Average 2021–2026

    38.1 °F

  • Average High 2021–2026

    43.7 °F
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