Deer Isle - Sylvester Cove Weather Forecast

    • 50
    • 72

    Decreasing Clouds

    • 50
    • 71

    Mostly Sunny

    • 53
    • 75

    Partly Sunny

    • 49
    • 79

    Mostly Sunny

    • 50
    • 74

    Mostly Sunny

    • 53
    • 72

    Partly Sunny

Today 8 Sep Coastal Hancock

Patchy fog this morning. Partly sunny. Highs around 70. Northwest Winds 5 to 10 Mph, becoming west with Gusts up to 20 Mph this afternoon.

Tonight 8 Sep Coastal Hancock

Mostly cloudy in the Evening, then clearing. Patchy fog after midnight. Lows in the upper 40s. West Winds around 5 Mph, becoming north after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Deer Isle - Sylvester Cove Temperature Statistics

September Temperature

Rockland, Knox County Regional Airport (21.1 miles)

  • Lowest 3 September, 2025

    50 °F

  • Average September

    62.9 °F

  • Highest 1 September, 2025

    75.9 °F

Climate (2020–Present)

Rockland, Knox County Regional Airport (21.1 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    39.9 °F

  • Average 2020–2025

    48 °F

  • Average High 2020–2025

    55.3 °F
Get WillyWeather+ to remove ads