Granite Bay State Marine Park Weather Forecast

    • 38
    • 47

    Rain Showers

    • 40
    • 47

    Chance Rain Showers

    • 40
    • 48

    Rain Showers

    • 44
    • 52

    Partly Sunny

    • 48
    • 60

    Mostly Sunny

    • 49
    • 63

    Mostly Sunny

Today 29 May West Prince William Sound & Whittier

Numerous rain Showers in the Morning, then scattered rain Showers in the afternoon. Highs in the mid 40s. Light Winds becoming variable 10 Mph in the afternoon.

Tonight 29 May West Prince William Sound & Whittier

Mostly cloudy. Scattered rain Showers in the Evening, then a slight chance of rain after midnight. Lows in the upper 30s. Variable wind 10 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

    41.2 °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

    43.6 °F
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