Isle Au Haut - Old Cove Weather Forecast

    • 57
    • 67

    Becoming Sunny

    • 55
    • 67

    Sunny

    • 57
    • 63

    Partly Sunny

    • 58
    • 64

    Chance Rain Showers

    • 54
    • 68

    Mostly Sunny

    • 58
    • 63

    Slight Chance Rain Showers

Today 10 Sep Knox

Partly sunny. Highs in the lower 80s. West Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 10 Sep Knox

Partly cloudy. Lows in the lower 50s. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph in the Evening, becoming light and variable.

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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

    61.9 °F

  • Highest 7 September, 2026

    78.1 °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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