Isle Au Haut - Old Cove Weather Forecast

    • 61
    • 63

    Rain

    • 56
    • 68

    Partly Sunny

    • 55
    • 66

    Sunny

    • 57
    • 63

    Partly Sunny

    • 59
    • 65

    Slight Chance Rain Showers

    • 56
    • 68

    Partly Sunny

Today 9 Sep Knox

Mostly cloudy. Highs in the upper 60s. East Winds around 10 Mph, becoming south this afternoon.

Tonight 9 Sep Knox

Showers. A slight chance of Thunderstorms after midnight. Lows in the lower 60s. South Winds 15 to 20 Mph with Gusts up to 35 Mph. Chance of rain near 100 percent.

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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

    61.8 °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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