Granite Bay State Marine Park Weather Forecast

    • 48
    • 58

    Becoming Sunny

    • 48
    • 58

    Chance Rain

    • 46
    • 53

    Chance Rain

    • 49
    • 59

    Rain Showers Likely

    • 49
    • 58

    Rain Showers Likely

    • 51
    • 58

    Rain Showers Likely

Today 29 Aug West Prince William Sound & Whittier

Partly sunny with a chance of Showers in the Morning, then sunny in the afternoon. Highs in the upper 50s. Northwest wind 10 to 20 Mph with Gusts to 35 Mph.

Tonight 29 Aug West Prince William Sound & Whittier

Clear. Lows near 50. Northwest wind 10 to 25 Mph with Gusts to 40 Mph.

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  • 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

    55.5 °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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