Great Diamond Island Weather Forecast

    • 44
    • 49

    Mostly Cloudy

    • 41
    • 54

    Partly Sunny

    • 43
    • 49

    Chance Rain Showers

    • 41
    • 49

    Chance Rain Showers

    • 49
    • 56

    Slight Chance Rain Showers

    • 52
    • 61

    Slight Chance Rain Showers

    • 49
    • 57

    Rain Showers Likely

Today 30 Apr Coastal Cumberland

Rain. Patchy fog. Highs in the upper 40s. Light and variable Winds. Chance of rain 90 percent.

Tonight 30 Apr Coastal Cumberland

Patchy fog in the evening. Mostly cloudy with a chance of Showers in the Evening, then partly cloudy after midnight. Lows around 40. Light and variable Winds. Chance of rain 50 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 7 April, 2026

    24.7 °F

  • Average April

    44.7 °F

  • Highest 14 April, 2026

    68.6 °F

Climate (2021–Present)

Portland, Portland International Jetport (5 miles)

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  • Average Low 2021–2026

    40.1 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    57.2 °F
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