Granite Bay State Marine Park Weather Forecast

    • 44
    • 51

    Rain

    • 43
    • 53

    Rain Showers

    • 40
    • 50

    Rain Showers

    • 40
    • 46

    Rain Showers

    • 40
    • 46

    Rain Showers

    • 41
    • 47

    Rain Showers

    • 41
    • 48

    Rain Showers Likely

Today 27 Sep West Prince William Sound & Whittier

Showers likely. Lows in the lower 40s. Highs in the upper 40s.

Tonight 27 Sep West Prince William Sound & Whittier

Rain. Lows in the mid 40s. Northeast wind 15 Mph.

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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 24 September, 2026

    30 °F

  • Average September

    49.8 °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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