Granite Bay State Marine Park Weather Forecast

    • 50
    • 59

    Rain Likely

    • 48
    • 54

    Rain

    • 47
    • 56

    Rain Likely

    • 46
    • 52

    Rain Showers

    • 46
    • 53

    Rain Showers Likely

    • 46
    • 51

    Rain Showers

Today 14 Sep West Prince William Sound & Whittier

Mostly sunny in the morning then becoming partly cloudy. Highs in the upper 50s. Northwest wind 15 Mph shifting to the variable in the afternoon. Gusts to 25 Mph.

Tonight 14 Sep West Prince William Sound & Whittier

Mostly cloudy with a chance of rain. Lows around 50. Variable wind 10 Mph. Gusts to 25 Mph after midnight.

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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

    53.2 °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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