Granite Bay State Marine Park Weather Forecast

    • 52
    • 63

    Rain Showers

    • 55
    • 67

    Partly Sunny

    • 55
    • 70

    Partly Sunny

    • 54
    • 68

    Partly Sunny

    • 53
    • 63

    Rain Showers Likely

    • 52
    • 62

    Rain Showers Likely

Today 12 Aug West Prince William Sound & Whittier

Mostly cloudy with scattered Showers. Haze. Highs around 60. Light Winds becoming variable 10 Mph in the afternoon.

Tonight 12 Aug West Prince William Sound & Whittier

Mostly cloudy. Lows in the lower 50s. 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

    56.4 °F

  • Highest 1 August, 2026

    73 °F

Climate (2021–2026)

Portage, Portage Glacier (25.5 miles)

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  • Average Low 2021–2026

    32.1 °F

  • Average 2021–2026

    38.1 °F

  • Average High 2021–2026

    43.7 °F
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