Monhegan Island Harbor Weather Forecast

    • 60
    • 64

    Chance Rain Showers

    • 47
    • 66

    Mostly Sunny

    • 46
    • 60

    Mostly Sunny

    • 57
    • 60

    Mostly Sunny

    • 59
    • 62

    Partly Sunny

    • 59
    • 65

    Partly Sunny

Today 18 Sep Lincoln

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

Tonight 18 Sep Lincoln

Cloudy with isolated Showers. Patchy fog. Lows in the lower 50s. Light and variable Winds. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

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Monhegan Island Harbor Temperature Statistics

September Temperature

Rockland, Knox County Regional Airport (23.6 miles)

  • Lowest 10 September, 2025

    43 °F

  • Average September

    60 °F

  • Highest 1 September, 2025

    75.9 °F

Climate (2020–Present)

Rockland, Knox County Regional Airport (23.6 miles)

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  • Average Low 2020–2025

    39.9 °F

  • Average 2020–2025

    48 °F

  • Average High 2020–2025

    55.3 °F
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