Granite Bay State Marine Park Weather Forecast

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    Rain Showers

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    Rain

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    Rain Showers

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    Mostly Cloudy

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    Rain Showers Likely

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    Rain Showers

Today 21 May West Prince William Sound & Whittier

Rain in the Morning, then widespread rain Showers in the afternoon. Highs in the mid 40s. South wind 10 to 15 Mph with Gusts to 25 Mph.

Tonight 21 May West Prince William Sound & Whittier

Numerous rain Showers. Lows in the upper 30s. South wind 10 to 15 Mph with Gusts to 25 Mph.

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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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