Granite Bay State Marine Park Weather Forecast

    • 51
    • 54

    Rain

    • 49
    • 54

    Rain

    • 48
    • 60

    Partly Sunny

    • 50
    • 62

    Partly Sunny

    • 50
    • 60

    Mostly Cloudy

    • 48
    • 57

    Slight Chance Rain Showers

    • 48
    • 58

    Rain Showers Likely

Today 7 Sep West Prince William Sound & Whittier

Rain. Highs in the mid 50s. East wind 10 to 15 Mph.

Tonight 7 Sep West Prince William Sound & Whittier

A chance of rain in the Evening, then rain after midnight. Lows in the lower 50s. Southeast wind 10 to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Granite Bay State Marine Park Temperature Statistics

September Temperature

Portage, Portage Glacier (25.5 miles)

  • Lowest 2 September, 2026

    30.9 °F

  • Average September

    51.8 °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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