Granite Bay State Marine Park Weather Forecast

    • 51
    • 59

    Increasing Clouds

    • 49
    • 59

    Partly Sunny

    • 50
    • 59

    Mostly Cloudy

    • 50
    • 58

    Cloudy

    • 50
    • 55

    Rain Showers

    • 48
    • 56

    Rain Showers Likely

Today 11 Sep West Prince William Sound & Whittier

Sunny. Highs in the upper 50s. Variable wind 10 Mph in the morning becoming light.

Tonight 11 Sep West Prince William Sound & Whittier

Partly cloudy. Lows in the lower 50s. Light Winds becoming variable 10 Mph after midnight.

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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

    52.3 °F

  • Highest 3 September, 2026

    66 °F

Climate (2021–2026)

Portage, Portage Glacier (25.5 miles)

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  • Average Low 2021–2026

    32.2 °F

  • Average 2021–2026

    38.1 °F

  • Average High 2021–2026

    43.7 °F
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