Isle Au Haut - Old Cove Weather Forecast

    • 58
    • 71

    Increasing Clouds

    • 53
    • 66

    Mostly Sunny

    • 59
    • 60

    Breezy

    • 57
    • 71

    Partly Sunny

    • 54
    • 65

    Mostly Sunny

    • 56
    • 63

    Partly Sunny

Today 7 Sep Knox

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

Tonight 7 Sep Knox

Partly cloudy. Lows in the upper 40s. Light and variable Winds.

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Isle Au Haut - Old Cove Temperature Statistics

September Temperature

Rockland, Knox County Regional Airport (24.2 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 (24.2 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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