Granite Bay State Marine Park Weather Forecast

    • 48
    • 52

    Rain

    • 43
    • 51

    Rain

    • 43
    • 48

    Rain Showers

    • 41
    • 48

    Rain Showers Likely

    • 41
    • 49

    Rain Showers

    • 40
    • 47

    Rain Showers

Today 25 Sep West Prince William Sound & Whittier

A chance of rain in the Morning, then rain likely in the afternoon. Highs in the lower 50s. East wind 15 to 30 Mph with Gusts to 40 Mph.

Tonight 25 Sep West Prince William Sound & Whittier

Rain. Lows in the upper 40s. East wind 15 to 30 Mph. Gusts to 40 Mph in the evening.

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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

    50.2 °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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