Granite Bay State Marine Park Weather Forecast

    • 29
    • 37

    Mostly Sunny

    • 28
    • 38

    Partly Sunny

    • 32
    • 37

    Partly Sunny

    • 31
    • 37

    Chance Snow

    • 32
    • 36

    Rain/Snow Likely

    • 35
    • 39

    Rain/Snow Likely

Today 22 Jan West Prince William Sound & Whittier

Partly cloudy. Highs near 40. Variable wind 10 Mph in the morning becoming light.

Tonight 22 Jan West Prince William Sound & Whittier

Mostly clear. Lows in the 20s to mid 30s. Variable wind 10 Mph. Gusts to 20 Mph after midnight.

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Granite Bay State Marine Park Temperature Statistics

January Temperature

Portage, Portage Glacier (25.5 miles)

  • Lowest 8 January, 2026

    -4 °F

  • Average January

    19 °F

  • Highest 18 January, 2026

    45 °F

Climate (2021–Present)

Portage, Portage Glacier (25.5 miles)

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  • Average Low 2021–2026

    32.8 °F

  • Average 2021–2026

    38.6 °F

  • Average High 2021–2026

    44.2 °F
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