Granite Bay State Marine Park Weather Forecast

    • 54
    • 61

    Rain

    • 51
    • 55

    Rain

    • 50
    • 60

    Slight Chance Rain

    • 51
    • 61

    Chance Rain Showers

    • 50
    • 55

    Chance Rain Showers

    • 50
    • 56

    Chance Rain Showers

Today 24 Aug West Prince William Sound & Whittier

Mostly sunny in the morning then becoming partly cloudy. Highs in the upper 50s. West wind 10 to 20 Mph. Gusts to 30 Mph decreasing to 20 Mph in the afternoon.

Tonight 24 Aug West Prince William Sound & Whittier

Cloudy. A chance of rain after midnight. 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

August Temperature

Portage, Portage Glacier (25.5 miles)

  • Lowest 8 August, 2026

    42.1 °F

  • Average August

    56.1 °F

  • Highest 14 August, 2026

    73.9 °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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