Shelter Island Weather Forecast

    • 50
    • 64

    Increasing Clouds

    • 50
    • 61

    Rain

    • 47
    • 66

    Partly Sunny

    • 46
    • 62

    Partly Sunny

    • 46
    • 62

    Partly Sunny

    • 48
    • 61

    Chance Rain Showers

Today 19 Sep Coastal Cumberland

Mostly sunny. Highs in the mid 60s. Southwest Winds around 10 Mph.

Tonight 19 Sep Coastal Cumberland

Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 40s. South Winds around 10 Mph in the Evening, becoming light and variable.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Shelter Island Temperature Statistics

September Temperature

Portland, Portland International Jetport (18 miles)

  • Lowest 12 September, 2026

    43.6 °F

  • Average September

    64.2 °F

  • Highest 10 September, 2026

    85.6 °F

Climate (2021–2026)

Portland, Portland International Jetport (18 miles)

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  • Average Low 2021–2026

    40 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    57.3 °F
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