Granite Bay State Marine Park Weather Forecast

    • 49
    • 59

    Partly Sunny

    • 51
    • 61

    Partly Sunny

    • 50
    • 60

    Partly Sunny

    • 48
    • 58

    Mostly Cloudy

    • 48
    • 60

    Partly Sunny

    • 49
    • 58

    Rain Showers Likely

Today 9 Sep West Prince William Sound & Whittier

Mostly sunny. Highs in the lower 60s. Northwest wind 15 to 30 Mph with Gusts to 45 Mph.

Tonight 9 Sep West Prince William Sound & Whittier

Partly cloudy. Lows in the lower 50s. Northwest wind 15 to 30 Mph with Gusts to 40 Mph.

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Granite Bay State Marine Park Temperature Statistics

September Temperature

Portage, Portage Glacier (25.5 miles)

  • Lowest 2 September, 2026

    30.9 °F

  • Average September

    52 °F

  • Highest 3 September, 2026

    66 °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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