Harpswell Weather Forecast

    • 56
    • 81

    Partly Sunny

    • 54
    • 72

    Sunny

    • 60
    • 69

    Mostly Sunny

    • 62
    • 68

    Slight Chance Rain Showers

    • 58
    • 71

    Partly Sunny

    • 62
    • 67

    Mostly Cloudy

Today 10 Sep Coastal Cumberland

Mostly sunny. A chance of Showers this morning. Highs in the lower 80s. Southwest Winds 10 to 15 Mph with Gusts up to 30 Mph, becoming west 15 to 25 Mph with Gusts up to 40 Mph this afternoon. Chance of rain 50 percent.

Tonight 10 Sep Coastal Cumberland

Partly cloudy. Less humid with Lows in the lower 50s. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

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Harpswell Temperature Statistics

September Temperature

Wiscasset Airport (17.4 miles)

  • Lowest 1 September, 2026

    51.1 °F

  • Average September

    66 °F

  • Highest 4 September, 2026

    82 °F

Climate (2021–2026)

Wiscasset Airport (17.4 miles)

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  • Average Low 2021–2026

    38.7 °F

  • Average 2021–2026

    48.5 °F

  • Average High 2021–2026

    58.1 °F
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