Great Diamond Island Weather Forecast

    • 42
    • 53

    Mostly Sunny

    • 42
    • 51

    Slight Chance Rain

    • 50
    • 53

    Rain

    • 46
    • 56

    Chance Rain

    • 39
    • 49

    Slight Chance Rain

    • 37
    • 48

    Chance Rain

    • 43
    • 49

    Chance Rain

Today 28 Oct Coastal Cumberland

Mostly sunny. Highs in the mid 50s. Northeast Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 28 Oct Coastal Cumberland

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the mid 30s. Northeast Winds around 10 Mph with Gusts up to 25 Mph.

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Great Diamond Island Temperature Statistics

October Temperature

Portland, Portland International Jetport (5 miles)

  • Lowest 10 October, 2025

    32 °F

  • Average October

    53.2 °F

  • Highest 6 October, 2025

    84.9 °F

Climate (2020–Present)

Portland, Portland International Jetport (5 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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