Granite Bay State Marine Park Weather Forecast

    • 51
    • 56

    Chance Rain

    • 51
    • 64

    Sunny

    • 52
    • 64

    Mostly Sunny

    • 50
    • 63

    Mostly Cloudy

    • 49
    • 57

    Rain Showers Likely

    • 50
    • 60

    Slight Chance Rain Showers

Today 23 Jul West Prince William Sound & Whittier

Mostly cloudy with a chance of rain in the Morning, then mostly sunny in the afternoon. Highs in the mid 50s. Southwest wind 10 to 20 Mph. Gusts to 40 Mph increasing to 50 Mph in the afternoon.

Tonight 23 Jul West Prince William Sound & Whittier

Clear. Lows in the lower 50s. West wind 15 to 30 Mph with Gusts to 40 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 °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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