Bay of Isles - South Arm Weather Forecast

    • 45
    • 55

    Rain Showers

    • 43
    • 49

    Rain

    • 45
    • 50

    Rain Showers

    • 45
    • 51

    Rain Likely

    • 44
    • 50

    Chance Rain

    • 44
    • 51

    Chance Rain

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    Rain Likely

Today 17 Sep West Prince William Sound & Whittier

Sunny. Highs in the mid 50s. West wind 15 Mph.

Tonight 17 Sep West Prince William Sound & Whittier

Partly cloudy in the Evening, then cloudy with scattered Showers after midnight. Lows in the upper 40s. Northwest wind 15 Mph shifting to the variable after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Bay of Isles - South Arm Temperature Statistics

September Temperature

Portage, Portage Glacier (47.8 miles)

  • Lowest 15 September, 2025

    41 °F

  • Average September

    52.1 °F

  • Highest 4 September, 2025

    64 °F

Climate (2020–Present)

Portage, Portage Glacier (47.8 miles)

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  • Average Low 2020–2025

    33.5 °F

  • Average 2020–2025

    39.4 °F

  • Average High 2020–2025

    45 °F
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