Isle Au Haut - Merchants Cove Weather Forecast

    • 56
    • 64

    Rain Showers

    • 56
    • 68

    Partly Sunny

    • 56
    • 66

    Partly Sunny

    • 56
    • 66

    Slight Chance Rain Showers

    • 51
    • 69

    Mostly Sunny

    • 52
    • 64

    Mostly Sunny

Today 7 Sep Knox

Showers. Patchy fog. Highs in the mid 60s. Light and variable Winds. Chance of rain 90 percent.

Tonight 7 Sep Knox

Mostly cloudy in the Evening, then becoming partly cloudy. Lows in the lower 50s. Light and variable Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Isle Au Haut - Merchants Cove Temperature Statistics

September Temperature

Rockland, Knox County Regional Airport (23.6 miles)

  • Lowest 3 September, 2025

    50 °F

  • Average September

    61.7 °F

  • Highest 1 September, 2025

    75.9 °F

Climate (2020–Present)

Rockland, Knox County Regional Airport (23.6 miles)

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  • Average Low 2020–2025

    39.9 °F

  • Average 2020–2025

    48 °F

  • Average High 2020–2025

    55.3 °F
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