Portland Island Weather Forecast

    • 54
    • 61

    Mostly Cloudy

    • 52
    • 63

    Chance Rain

    • 53
    • 61

    Rain Likely

    • 52
    • 60

    Rain Likely

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    • 60

    Rain

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    • 61

    Rain

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    • 61

    Rain

Today 6 Sep City and Borough of Juneau

Mostly cloudy. Highs in the lower 60s. West Winds around 10 Mph.

Tonight 6 Sep City and Borough of Juneau

Mostly cloudy. Lows in the lower 50s. Light Winds.

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Portland Island Temperature Statistics

September Temperature

Juneau, Juneau International Airport (5.6 miles)

  • Lowest 1 September, 2025

    44.1 °F

  • Average September

    58 °F

  • Highest 3 September, 2025

    73 °F

Climate (2020–Present)

Juneau, Juneau International Airport (5.6 miles)

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  • Average Low 2020–2025

    37.6 °F

  • Average 2020–2025

    43.3 °F

  • Average High 2020–2025

    48.9 °F
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