Monhegan Island Harbor Weather Forecast

    • 60
    • 68

    Increasing Clouds

    • 56
    • 67

    Partly Sunny

    • 61
    • 64

    Rain Showers Likely

    • 58
    • 69

    Slight Chance Rain Showers

    • 56
    • 63

    Mostly Sunny

    • 58
    • 62

    Partly Sunny

Today 7 Sep Lincoln

Mostly sunny. Highs in the upper 70s. Northwest Winds around 10 Mph.

Tonight 7 Sep Lincoln

Clear in the Evening, then becoming partly cloudy. Lows in the upper 50s. Light and variable Winds.

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Monhegan Island Harbor Temperature Statistics

September Temperature

Rockland, Knox County Regional Airport (23.6 miles)

  • Lowest 1 September, 2026

    48.9 °F

  • Average September

    61.7 °F

  • Highest 4 September, 2026

    73 °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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