Granite Bay State Marine Park Weather Forecast

    • 47
    • 53

    Rain

    • 45
    • 51

    Rain Showers

    • 45
    • 53

    Rain Showers

    • 42
    • 50

    Rain Showers

    • 42
    • 51

    Chance Rain Showers

    • 43
    • 52

    Chance Rain Showers

    • 44
    • 51

    Rain Showers Likely

Today 18 Sep West Prince William Sound & Whittier

Showers likely. Lows in the mid 40s. Highs in the lower 50s.

Tonight 18 Sep West Prince William Sound & Whittier

Rain. Lows in the upper 40s. Southwest wind 10 to 20 Mph. Gusts to 45 Mph decreasing to 25 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Granite Bay State Marine Park Temperature Statistics

September Temperature

Portage, Portage Glacier (25.5 miles)

  • Lowest 2 September, 2026

    30.9 °F

  • Average September

    52.4 °F

  • Highest 11 September, 2026

    68 °F

Climate (2021–2026)

Portage, Portage Glacier (25.5 miles)

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  • Average Low 2021–2026

    32.2 °F

  • Average 2021–2026

    38.2 °F

  • Average High 2021–2026

    43.8 °F
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