South Harpswell Weather Forecast

    • 61
    • 68

    Decreasing Clouds

    • 46
    • 68

    Mostly Sunny

    • 46
    • 62

    Sunny

    • 56
    • 63

    Mostly Sunny

    • 60
    • 66

    Partly Sunny

    • 61
    • 70

    Partly Sunny

Today 18 Sep Coastal Cumberland

Patchy fog in the morning. Mostly cloudy with isolated Showers in the Morning, then mostly sunny in the afternoon. Highs in the mid 70s. Light and variable Winds, becoming south around 10 Mph in the afternoon. Chance of rain 20 percent.

Tonight 18 Sep Coastal Cumberland

Mostly clear. Lows in the mid 50s. Light and variable Winds.

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South Harpswell Temperature Statistics

September Temperature

Portland, Portland International Jetport (15.5 miles)

  • Lowest 9 September, 2025

    46 °F

  • Average September

    62.4 °F

  • Highest 11 September, 2025

    80.1 °F

Climate (2020–Present)

Portland, Portland International Jetport (15.5 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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