Granite Bay State Marine Park Weather Forecast

    • 42
    • 46

    Chance Rain

    • 41
    • 48

    Rain Showers

    • 44
    • 51

    Chance Rain

    • 49
    • 60

    Mostly Sunny

    • 48
    • 62

    Mostly Sunny

    • 47
    • 59

    Mostly Sunny

Today 30 May West Prince William Sound & Whittier

Mostly cloudy. A slight chance of rain in the Morning, then isolated rain Showers in the afternoon. Highs in the mid 40s. Light Winds.

Tonight 30 May West Prince William Sound & Whittier

Mostly cloudy with scattered rain Showers. Lows in the lower 40s. Light Winds.

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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

    41.4 °F

  • Highest 25 May, 2026

    57 °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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