Monhegan Island Weather Forecast

    • 59
    • 63

    Patchy Fog

    • 45
    • 66

    Becoming Sunny

    • 48
    • 60

    Mostly Sunny

    • 56
    • 60

    Mostly Sunny

    • 59
    • 62

    Partly Sunny

    • 58
    • 65

    Chance Rain Showers

    • 57
    • 63

    Chance Rain Showers

Today 18 Sep Lincoln

Partly sunny. Highs in the mid 70s. Light and variable Winds.

Tonight 18 Sep Lincoln

Partly cloudy. Patchy fog. Lows in the mid 50s. Light and variable Winds.

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  • Temperature Real-Time

Monhegan Island Temperature Statistics

September Temperature

Rockland, Knox County Regional Airport (23 miles)

  • Lowest 10 September, 2025

    43 °F

  • Average September

    59.9 °F

  • Highest 1 September, 2025

    75.9 °F

Climate (2020–Present)

Rockland, Knox County Regional Airport (23 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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