Granite Bay State Marine Park Weather Forecast

    • 51
    • 61

    Mostly Cloudy

    • 53
    • 62

    Partly Sunny

    • 52
    • 62

    Mostly Cloudy

    • 52
    • 64

    Partly Sunny

    • 51
    • 63

    Partly Sunny

    • 51
    • 61

    Chance Rain Showers

Today 28 Jul West Prince William Sound & Whittier

Mostly cloudy. Highs near 60. Light Winds becoming variable 10 Mph in the afternoon.

Tonight 28 Jul West Prince William Sound & Whittier

Mostly cloudy. Lows around 50. Southwest wind 10 to 20 Mph.

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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

    52.8 °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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