Granite Bay State Marine Park Weather Forecast

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    • 43

    Rain

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    • 44

    Chance Rain Showers

    • 38
    • 48

    Mostly Cloudy

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    • 49

    Rain Showers

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    Rain Showers

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    Rain Showers

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    Rain Showers Likely

Today 22 May West Prince William Sound & Whittier

Rain Showers. Highs in the mid 40s. Southeast wind 10 to 15 Mph.

Tonight 22 May West Prince William Sound & Whittier

Rain Showers likely. Lows in the upper 30s. 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

May Temperature

Portage, Portage Glacier (25.5 miles)

  • Lowest 9 May, 2026

    32 °F

  • Average May

    40.8 °F

  • Highest 14 May, 2026

    52 °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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