Islesboro Island - Grindel Point Weather Forecast

    • 54
    • 64

    Decreasing Clouds

    • 54
    • 68

    Slight Chance Rain Showers

    • 53
    • 69

    Mostly Sunny

    • 54
    • 69

    Mostly Sunny

    • 55
    • 71

    Partly Sunny

    • 56
    • 69

    Partly Sunny

Today 13 Sep Coastal Waldo

Mostly cloudy. Highs in the upper 60s. South Winds around 10 Mph.

Tonight 13 Sep Coastal Waldo

Partly cloudy. Patchy fog after midnight. Lows in the lower 50s. Light and variable Winds.

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  • Temperature Real-Time

Islesboro Island - Grindel Point Temperature Statistics

September Temperature

Rockland, Knox County Regional Airport (16.8 miles)

  • Lowest 10 September, 2025

    43 °F

  • Average September

    60.4 °F

  • Highest 1 September, 2025

    75.9 °F

Climate (2020–Present)

Rockland, Knox County Regional Airport (16.8 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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