Isle Au Haut - Merchants Cove Weather Forecast

    • 42
    • 46

    Slight Chance Rain

    • 28
    • 51

    Rain

    • 33
    • 39

    Chance Rain

    • 22
    • 43

    Chance Rain

    • 20
    • 27

    Partly Sunny

    • 28
    • 37

    Rain/Snow Likely

    • 21
    • 34

    Partly Sunny

Today 18 Dec Knox

Partly sunny. Highs in the lower 40s. South Winds around 10 Mph with Gusts up to 20 Mph.

Tonight 18 Dec Knox

Partly cloudy in the Evening, then cloudy with a chance of rain after midnight. Patchy fog after midnight. Lows in the upper 30s. South Winds 10 to 15 Mph with Gusts up to 35 Mph. Chance of rain 50 percent.

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  • Temperature Real-Time

Isle Au Haut - Merchants Cove Temperature Statistics

December Temperature

Rockland, Knox County Regional Airport (23.6 miles)

  • Lowest 9 December, 2025

    -2 °F

  • Average December

    25.1 °F

  • Highest 10 December, 2025

    45 °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

    47.9 °F

  • Average High 2020–2025

    55.2 °F
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