Granite Bay State Marine Park Weather Forecast

    • 53
    • 56

    Rain Likely

    • 53
    • 55

    Rain

    • 50
    • 56

    Rain

    • 50
    • 57

    Rain Showers

    • 49
    • 55

    Rain Showers

    • 50
    • 60

    Rain Showers Likely

Today 18 Aug West Prince William Sound & Whittier

Mostly cloudy. A slight chance of rain in the Morning, then scattered Showers in the afternoon. Highs in the mid 50s. Variable wind 10 Mph.

Tonight 18 Aug West Prince William Sound & Whittier

Mostly cloudy. Scattered Showers in the Evening, then a chance of rain after midnight. Lows in the lower 50s. Variable wind 10 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 8 August, 2026

    42.1 °F

  • Average August

    57.1 °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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