Granite Bay State Marine Park Weather Forecast

    • 48
    • 54

    Rain

    • 48
    • 52

    Rain

    • 44
    • 52

    Rain

    • 44
    • 56

    Chance Rain Showers

    • 45
    • 58

    Mostly Cloudy

    • 47
    • 60

    Partly Sunny

Today 12 Jun West Prince William Sound & Whittier

Showers likely in the afternoon. Highs in the mid 50s. Light Winds becoming variable 10 Mph with Gusts to 20 Mph in the afternoon.

Tonight 12 Jun West Prince William Sound & Whittier

A slight chance of rain in the Evening, then rain after midnight. Lows in the upper 40s. Northeast wind 10 to 25 Mph. Gusts to 30 Mph increasing to 40 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Granite Bay State Marine Park Temperature Statistics

June Temperature

Portage, Portage Glacier (25.5 miles)

  • Lowest 2 June, 2026

    37 °F

  • Average June

    52 °F

  • Highest 4 June, 2026

    75.9 °F

Climate (2021–Present)

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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