Great Diamond Island Weather Forecast

    • 17
    • 31

    Clearing Late

    • 19
    • 25

    Partly Sunny

    • 26
    • 31

    Partly Sunny

    • 27
    • 41

    Partly Sunny

    • 40
    • 44

    Breezy

    • 21
    • 45

    Breezy

Today 14 Dec Coastal Cumberland

Snow. Snow accumulation around an inch. Highs in the lower 30s. North Winds 10 to 15 Mph. Gusts up to 30 Mph this afternoon. Chance of snow near 100 percent.

Tonight 14 Dec Coastal Cumberland

Partly cloudy with a chance of snow in the Evening, then mostly clear after midnight. Lows around 12. Northwest Winds 15 to 20 Mph with Gusts up to 35 Mph. Chance of snow 30 percent. Wind chill Values as low as 1 below.

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Great Diamond Island Temperature Statistics

December Temperature

Portland, Portland International Jetport (5 miles)

  • Lowest 9 December, 2025

    -0.9 °F

  • Average December

    24.2 °F

  • Highest 1 December, 2025

    39 °F

Climate (2020–Present)

Portland, Portland International Jetport (5 miles)

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  • Average Low 2020–2025

    40.4 °F

  • Average 2020–2025

    48.9 °F

  • Average High 2020–2025

    57.3 °F
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