Granite Bay State Marine Park Weather Forecast

    • 56
    • 64

    Rain

    • 55
    • 58

    Rain

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    • 57

    Rain Showers

    • 50
    • 57

    Rain Showers

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    Rain Showers

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    Rain Showers

Today 15 Aug West Prince William Sound & Whittier

Mostly cloudy with a chance of rain. Highs in the upper 50s. Variable wind 10 Mph. Gusts to 20 Mph in the morning.

Tonight 15 Aug West Prince William Sound & Whittier

Rain. Lows in the lower 50s. Southeast wind 15 Mph with Gusts to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Granite Bay State Marine Park Temperature Statistics

August Temperature

Portage, Portage Glacier (25.5 miles)

  • Lowest 8 August, 2026

    42.1 °F

  • Average August

    56.6 °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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