Granite Bay State Marine Park Weather Forecast

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    • 41

    Rain

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    • 40

    Rain

    • 36
    • 41

    Rain

    • 31
    • 39

    Rain/Snow Likely

    • 30
    • 37

    Slight Chance Rain/Snow

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    Rain/Snow

Today 18 Oct West Prince William Sound & Whittier

Mostly sunny in the morning then becoming partly cloudy. Highs in the lower 40s. Northeast wind 10 to 15 Mph with Gusts to 25 Mph.

Tonight 18 Oct West Prince William Sound & Whittier

A chance of rain Showers in the Evening, then rain Showers after midnight. Locally heavy rainfall possible after midnight. Lows in the mid 30s to lower 40s. East wind 15 Mph. Gusts to 30 Mph.

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Granite Bay State Marine Park Temperature Statistics

October Temperature

Portage, Portage Glacier (25.5 miles)

  • Lowest 2 October, 2026

    30.9 °F

  • Average October

    41.6 °F

  • Highest 15 October, 2026

    50 °F

Climate (2021–2026)

Portage, Portage Glacier (25.5 miles)

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  • Average Low 2021–2026

    32.3 °F

  • Average 2021–2026

    38.3 °F

  • Average High 2021–2026

    43.9 °F
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