Great Diamond Island Weather Forecast

    • 50
    • 59

    Chance Rain Showers

    • 42
    • 61

    Mostly Sunny

    • 46
    • 51

    Chance Rain Showers

    • 51
    • 54

    Chance Rain Showers

    • 47
    • 57

    Rain Showers Likely

    • 44
    • 55

    Slight Chance Rain Showers

Today 29 Apr Coastal Cumberland

Mostly sunny. Highs in the lower 70s. South Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 29 Apr Coastal Cumberland

Partly cloudy in the Evening, then becoming mostly cloudy. A 40 percent chance of Showers. Lows in the mid 50s. Southwest Winds 10 to 15 Mph with Gusts up to 30 Mph.

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Great Diamond Island Temperature Statistics

April Temperature

Portland, Portland International Jetport (5 miles)

  • Lowest 10 April, 2025

    23.8 °F

  • Average April

    44.6 °F

  • Highest 19 April, 2025

    79.6 °F

Climate (2020–Present)

Portland, Portland International Jetport (5 miles)

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  • Average Low 2020–2025

    40.6 °F

  • Average 2020–2025

    49 °F

  • Average High 2020–2025

    57.4 °F
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