Granite Bay State Marine Park Weather Forecast

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    Rain

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    Rain

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    Rain

    • 48
    • 60

    Rain Showers Likely

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    Chance Rain Showers

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    Rain Showers Likely

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    Rain Showers Likely

Today 6 Sep West Prince William Sound & Whittier

A chance of rain in the Morning, then rain in the afternoon. Highs in the mid 50s. Northeast wind 15 Mph. Gusts to 25 Mph in the afternoon.

Tonight 6 Sep West Prince William Sound & Whittier

Rain. Lows in the lower 50s. Northeast wind 10 to 20 Mph with Gusts to 30 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

    51 °F

  • Highest 3 September, 2026

    66 °F

Climate (2021–2026)

Portage, Portage Glacier (25.5 miles)

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  • Average Low 2021–2026

    32.1 °F

  • Average 2021–2026

    38.1 °F

  • Average High 2021–2026

    43.7 °F
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