Great Diamond Island Weather Forecast

    • 40
    • 51

    Rain Showers

    • 39
    • 53

    Mostly Sunny

    • 37
    • 47

    Mostly Sunny

    • 46
    • 50

    Chance Rain Showers

    • 36
    • 50

    Rain Showers Likely

    • 38
    • 47

    Slight Chance Rain Showers

Today 20 Apr Coastal Cumberland

Showers. Highs in the mid 50s. Southwest Winds around 10 Mph with Gusts up to 20 Mph. Chance of rain near 100 percent.

Tonight 20 Apr Coastal Cumberland

Partly cloudy with a chance of Showers in the Evening, then mostly clear after midnight. Lows in the upper 30s. West Winds around 10 Mph with Gusts up to 25 Mph. Chance of rain 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Great Diamond Island Temperature Statistics

April Temperature

Portland, Portland International Jetport (5 miles)

  • Lowest 1 April, 2024

    27.8 °F

  • Average April

    43.7 °F

  • Highest 8 April, 2024

    64.7 °F

Climate (2019–Present)

Portland, Portland International Jetport (5 miles)

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  • Average Low 2019–2024

    40.8 °F

  • Average 2019–2024

    49 °F

  • Average High 2019–2024

    57.2 °F
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