Granite Bay State Marine Park Weather Forecast

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    Rain Showers

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    Mostly Sunny

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    Mostly Sunny

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    Rain Likely

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    Rain

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    Rain

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    Rain/Snow Likely

Today 25 Oct West Prince William Sound & Whittier

Rain. Highs in the mid 40s. Southeast wind 10 to 15 Mph shifting to the west in the afternoon.

Tonight 25 Oct West Prince William Sound & Whittier

Mostly cloudy with a chance of rain. Lows in the upper 30s. North wind 10 to 15 Mph shifting to the variable with Gusts to 20 Mph after midnight.

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Granite Bay State Marine Park Temperature Statistics

October Temperature

Portage, Portage Glacier (25.5 miles)

  • Lowest 23 October, 2026

    19.9 °F

  • Average October

    39.6 °F

  • Highest 15 October, 2026

    50 °F

Climate (2021–2026)

Portage, Portage Glacier (25.5 miles)

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  • Average Low 2021–2026

    32.2 °F

  • Average 2021–2026

    38.3 °F

  • Average High 2021–2026

    43.9 °F
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