Granite Bay State Marine Park Weather Forecast

    • 51
    • 55

    Rain Showers

    • 50
    • 54

    Rain

    • 51
    • 61

    Mostly Sunny

    • 53
    • 64

    Mostly Cloudy

    • 52
    • 60

    Chance Rain Showers

    • 51
    • 63

    Chance Rain Showers

Today 21 Aug West Prince William Sound & Whittier

Numerous Showers in the Morning, then scattered Showers in the afternoon. Highs in the mid 50s. Light Winds becoming variable 10 Mph in the afternoon.

Tonight 21 Aug West Prince William Sound & Whittier

Mostly cloudy with scattered Showers. Lows in the upper 40s. Variable wind 10 Mph in the evening becoming light.

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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 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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