Granite Bay State Marine Park Weather Forecast

    • 51
    • 59

    Rain

    • 51
    • 53

    Rain

    • 50
    • 56

    Slight Chance Rain

    • 49
    • 61

    Chance Rain Showers

    • 47
    • 57

    Rain Showers Likely

    • 48
    • 57

    Rain Showers Likely

Today 27 Aug West Prince William Sound & Whittier

Sunny in the morning then becoming partly cloudy. Highs in the upper 50s. West wind 15 Mph with Gusts to 25 Mph.

Tonight 27 Aug West Prince William Sound & Whittier

A slight chance of rain in the Evening, then rain after midnight. Lows in the upper 40s. South wind 15 Mph.

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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 24 August, 2026

    39 °F

  • Average August

    55.7 °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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