Granite Bay State Marine Park Weather Forecast

    • 47
    • 58

    Mostly Cloudy

    • 49
    • 58

    Mostly Cloudy

    • 48
    • 60

    Cloudy

    • 47
    • 58

    Rain Showers Likely

    • 47
    • 58

    Rain Showers Likely

    • 46
    • 57

    Chance Rain Showers

Today 19 Jun West Prince William Sound & Whittier

Mostly cloudy. Isolated Showers in the afternoon. Highs in the mid 50s to lower 60s. Light Winds becoming variable 10 Mph in the afternoon.

Tonight 19 Jun West Prince William Sound & Whittier

Partly cloudy in the evening then becoming mostly cloudy. Lows in the upper 40s. Variable wind 10 Mph.

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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 16 June, 2026

    34 °F

  • Average June

    51.8 °F

  • Highest 4 June, 2026

    75.9 °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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