Granite Bay State Marine Park Weather Forecast

    • 52
    • 56

    Rain Showers

    • 52
    • 56

    Rain

    • 50
    • 55

    Rain

    • 51
    • 62

    Chance Rain Showers

    • 53
    • 64

    Mostly Cloudy

    • 52
    • 62

    Chance Rain Showers

Today 20 Aug West Prince William Sound & Whittier

Rain in the Morning, then numerous Showers in the afternoon. Highs in the mid 50s. Variable wind 10 Mph. Gusts to 20 Mph in the morning.

Tonight 20 Aug West Prince William Sound & Whittier

Scattered Showers in the Evening, then numerous Showers after midnight. Lows in the lower 50s. Variable wind 10 Mph shifting to the variable 10 Mph with Gusts to 25 Mph after midnight.

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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

    56.8 °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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