Granite Bay State Marine Park Weather Forecast

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    • 54

    Rain

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    • 56

    Rain Showers

    • 46
    • 52

    Rain Showers Likely

    • 45
    • 52

    Rain Showers Likely

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    • 51

    Rain Showers

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    Rain Showers

Today 15 Sep West Prince William Sound & Whittier

Rain. Highs in the mid 50s. South wind 10 to 25 Mph. Gusts to 30 Mph increasing to 40 Mph in the afternoon.

Tonight 15 Sep West Prince William Sound & Whittier

Rain in the Evening, then partly cloudy after midnight. Rain may be heavy at Times in the evening. Lows in the upper 40s. Southwest wind 10 to 25 Mph with Gusts to 45 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

    53 °F

  • Highest 11 September, 2026

    68 °F

Climate (2021–2026)

Portage, Portage Glacier (25.5 miles)

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  • Average Low 2021–2026

    32.2 °F

  • Average 2021–2026

    38.2 °F

  • Average High 2021–2026

    43.8 °F
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