Monhegan Island Harbor Weather Forecast

    • 60
    • 67

    Decreasing Clouds

    • 57
    • 65

    Mostly Cloudy

    • 56
    • 64

    Mostly Sunny

    • 59
    • 65

    Partly Sunny

    • 57
    • 66

    Partly Sunny

    • 60
    • 65

    Chance Rain Showers

Today 4 Sep Lincoln

Partly sunny. Patchy fog in the morning. A slight chance of Showers in the afternoon. Highs around 80. Light and variable Winds. Chance of rain 20 percent.

Tonight 4 Sep Lincoln

Mostly clear with a slight chance of Showers in the Evening, then partly cloudy after midnight. Lows in the upper 50s. Light and variable Winds. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Monhegan Island Harbor Temperature Statistics

September Temperature

Rockland, Knox County Regional Airport (23.6 miles)

  • Lowest 1 September, 2026

    48.9 °F

  • Average September

    59.6 °F

  • Highest 1 September, 2026

    69.1 °F

Climate (2021–2026)

Rockland, Knox County Regional Airport (23.6 miles)

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  • Average Low 2021–2026

    39.5 °F

  • Average 2021–2026

    47.6 °F

  • Average High 2021–2026

    54.8 °F
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