Isle Au Haut - Old Cove Weather Forecast

    • 54
    • 67

    Partly Sunny

    • 54
    • 65

    Partly Sunny

    • 57
    • 66

    Mostly Sunny

    • 54
    • 67

    Partly Sunny

    • 58
    • 65

    Rain Showers Likely

    • 55
    • 69

    Slight Chance Rain Showers

Today 5 Sep Knox

Partly sunny. A slight chance of Showers in the morning. Highs in the lower 70s. North Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 20 percent.

Tonight 5 Sep Knox

Partly cloudy. Lows in the upper 50s. North Winds around 10 Mph.

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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

    59.7 °F

  • Highest 1 September, 2026

    69.1 °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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