Shelter Island Weather Forecast

    • 58
    • 72

    Decreasing Clouds

    • 44
    • 71

    Mostly Sunny

    • 44
    • 64

    Sunny

    • 52
    • 64

    Mostly Sunny

    • 57
    • 68

    Partly Sunny

    • 58
    • 73

    Partly Sunny

    • 55
    • 70

    Partly Sunny

Today 18 Sep Coastal Cumberland

Partly sunny. Highs in the mid 70s. South Winds around 10 Mph.

Tonight 18 Sep Coastal Cumberland

Mostly clear. Patchy fog after midnight. Lows in the mid 50s. Southwest Winds around 10 Mph in the Evening, becoming light and variable.

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Shelter Island Temperature Statistics

September Temperature

Portland, Portland International Jetport (18 miles)

  • Lowest 9 September, 2025

    46 °F

  • Average September

    62.3 °F

  • Highest 11 September, 2025

    80.1 °F

Climate (2020–Present)

Portland, Portland International Jetport (18 miles)

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  • Average Low 2020–2025

    40.5 °F

  • Average 2020–2025

    49 °F

  • Average High 2020–2025

    57.4 °F
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