Granite Bay State Marine Park Weather Forecast

    • 51
    • 62

    Mostly Sunny

    • 54
    • 61

    Rain

    • 51
    • 57

    Rain Likely

    • 51
    • 56

    Rain

    • 50
    • 56

    Rain Showers Likely

    • 48
    • 55

    Rain Showers Likely

    • 48
    • 57

    Rain Showers Likely

Today 3 Sep West Prince William Sound & Whittier

Mostly sunny. Highs around 60. Northeast wind 10 to 20 Mph shifting to the variable 10 Mph in the afternoon.

Tonight 3 Sep West Prince William Sound & Whittier

Mostly clear. A slight chance of rain after midnight. Lows in the upper 40s to mid 50s. Light Winds.

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Granite Bay State Marine Park Temperature Statistics

September Temperature

Portage, Portage Glacier (25.5 miles)

  • Lowest 1 September, 2026

    39.9 °F

  • Average September

    48.8 °F

  • Highest 1 September, 2026

    57.9 °F

Climate (2021–2026)

Portage, Portage Glacier (25.5 miles)

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  • Average Low 2021–2026

    32.2 °F

  • Average 2021–2026

    38.1 °F

  • Average High 2021–2026

    43.7 °F
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