Granite Bay State Marine Park Weather Forecast

    • 46
    • 53

    Rain Showers

    • 48
    • 58

    Mostly Sunny

    • 48
    • 59

    Mostly Sunny

    • 51
    • 59

    Rain Showers Likely

    • 50
    • 58

    Rain Showers Likely

    • 51
    • 57

    Rain Showers Likely

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    • 56

    Rain Showers Likely

Today 31 Aug West Prince William Sound & Whittier

Partly cloudy with scattered Showers. Highs in the lower 50s. Northwest wind 15 to 30 Mph with Gusts to 45 Mph.

Tonight 31 Aug West Prince William Sound & Whittier

Clear. Lows in the 40s. Northwest wind 15 to 30 Mph with Gusts to 45 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 27 August, 2026

    37 °F

  • Average August

    55.3 °F

  • Highest 14 August, 2026

    73.9 °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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