Granite Bay State Marine Park Weather Forecast

    • 38
    • 45

    Rain Showers

    • 38
    • 48

    Chance Rain

    • 39
    • 47

    Rain Showers

    • 40
    • 47

    Rain Showers Likely

    • 40
    • 49

    Chance Rain Showers

    • 43
    • 51

    Chance Rain Showers

    • 46
    • 55

    Partly Sunny

Today 27 May West Prince William Sound & Whittier

Widespread rain Showers in the Morning, then numerous rain Showers in the afternoon. Highs in the mid 40s. East wind 10 to 15 Mph with Gusts to 30 Mph.

Tonight 27 May West Prince William Sound & Whittier

Numerous rain Showers. Lows in the upper 30s. Northeast 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

    41.3 °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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