Granite Bay State Marine Park Weather Forecast

    • 42
    • 54

    Mostly Sunny

    • 46
    • 53

    Partly Sunny

    • 43
    • 52

    Rain

    • 44
    • 48

    Rain Showers

    • 43
    • 48

    Rain Showers

    • 42
    • 48

    Rain Showers

    • 42
    • 49

    Rain Showers Likely

Today 22 Sep West Prince William Sound & Whittier

Numerous rain Showers in the Morning, then isolated rain Showers in the afternoon. Highs in the lower 50s. North wind 15 Mph.

Tonight 22 Sep West Prince William Sound & Whittier

Mostly clear. Lows in the 40s. Northwest wind 10 to 20 Mph with Gusts to 30 Mph.

Graph Plots Open in Graphs

  • 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

    51.2 °F

  • Highest 11 September, 2026

    68 °F

Climate (2021–2026)

Portage, Portage Glacier (25.5 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    32.2 °F

  • Average 2021–2026

    38.2 °F

  • Average High 2021–2026

    43.8 °F
Get WillyWeather+ to remove ads