Sumner Island Weather Forecast

    • 50
    • 66

    Rain

    • 48
    • 60

    Rain

    • 49
    • 57

    Rain

    • 50
    • 58

    Rain

    • 49
    • 60

    Rain

    • 46
    • 59

    Rain

Today 16 Sep Western Kupreanof and Kuiu Island

Mostly cloudy. Chance of rain. Rain may be heavy at Times in the morning. Highs in the mid 60s. Southeast Winds 15 to 25 Mph with Gusts to around 40 Mph decreasing to 10 to 15 Mph in the afternoon.

Tonight 16 Sep Western Kupreanof and Kuiu Island

Windy. Rain likely. Lows around 50. Southeast Winds 10 to 15 Mph increasing to 20 to 30 Mph with Gusts to around 45 Mph late.

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Sumner Island Temperature Statistics

September Temperature

Kake - Kake Airport (38.5 miles)

  • Lowest 13 September, 2025

    41 °F

  • Average September

    54.5 °F

  • Highest 3 September, 2025

    66 °F

Climate (2020–Present)

Kake - Kake Airport (38.5 miles)

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  • Average Low 2020–2025

    39 °F

  • Average 2020–2025

    44 °F

  • Average High 2020–2025

    48.9 °F
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