Granite Bay State Marine Park Weather Forecast

    • 54
    • 62

    Increasing Clouds

    • 52
    • 63

    Partly Sunny

    • 52
    • 64

    Partly Sunny

    • 52
    • 66

    Partly Sunny

    • 51
    • 62

    Mostly Cloudy

    • 51
    • 60

    Chance Rain Showers

Today 29 Jul West Prince William Sound & Whittier

Partly cloudy in the morning then becoming mostly sunny. Highs near 60. West wind 10 to 25 Mph. Gusts to 35 Mph decreasing to 25 Mph in the afternoon.

Tonight 29 Jul West Prince William Sound & Whittier

Partly cloudy in the evening then becoming mostly cloudy. Lows in the lower 50s. Variable wind 10 Mph in the evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Granite Bay State Marine Park Temperature Statistics

July Temperature

Portage, Portage Glacier (25.5 miles)

  • Lowest 1 July, 2026

    34 °F

  • Average July

    52.9 °F

  • Highest 24 July, 2026

    71.1 °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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