Granite Bay State Marine Park Weather Forecast

    • 40
    • 42

    Rain/Snow

    • 39
    • 44

    Rain/Snow

    • 37
    • 43

    Rain

    • 36
    • 44

    Rain Showers

    • 36
    • 45

    Rain/Snow Likely

    • 36
    • 45

    Rain Showers Likely

Today 11 May West Prince William Sound & Whittier

Numerous rain Showers and snow Showers in the Morning, then rain and snow in the afternoon. No snow accumulation. Highs around 40. Southeast wind 10 to 20 Mph with Gusts to 30 Mph.

Tonight 11 May West Prince William Sound & Whittier

Rain and snow. No snow accumulation. Lows around 40. East wind 10 to 25 Mph. Gusts to 35 Mph increasing to 50 Mph after midnight.

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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

    39.6 °F

  • Highest 6 May, 2026

    46 °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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