Isle Au Haut - Old Cove Weather Forecast

    • 58
    • 67

    Chance Rain Showers

    • 54
    • 66

    Partly Sunny

    • 54
    • 64

    Partly Sunny

    • 57
    • 66

    Partly Sunny

    • 54
    • 66

    Partly Sunny

    • 57
    • 65

    Mostly Cloudy

Today 4 Sep Knox

Partly sunny. Patchy fog in the morning. A chance of Showers with a slight chance of Thunderstorms in the afternoon. Humid with Highs in the upper 70s. Light and variable Winds. Chance of rain 30 percent.

Tonight 4 Sep Knox

Cloudy. Areas of dense fog. Visibility one quarter mile or less at Times. Near steady temperature in the lower 60s. Light and variable Winds.

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  • Temperature Real-Time

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

    59.6 °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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