Castine Weather Forecast

    • 54
    • 68

    Sunny

    • 54
    • 67

    Mostly Sunny

    • 56
    • 65

    Partly Sunny

    • 57
    • 68

    Partly Sunny

    • 46
    • 64

    Mostly Sunny

    • 45
    • 58

    Mostly Sunny

Today 15 Sep Coastal Hancock

Sunny. Highs in the mid 70s. North Winds around 5 Mph, becoming west this afternoon.

Tonight 15 Sep Coastal Hancock

Mostly clear. Patchy fog after midnight. Lows in the lower 50s. Southwest Winds around 5 Mph, becoming northwest after midnight.

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Castine Temperature Statistics

September Temperature

Bar Harbor, Hancock County-Bar Harbor Airport (21.1 miles)

  • Lowest 10 September, 2025

    44.1 °F

  • Average September

    60.8 °F

  • Highest 1 September, 2025

    78.1 °F

Climate (2020–Present)

Bar Harbor, Hancock County-Bar Harbor Airport (21.1 miles)

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  • Average Low 2020–2025

    38.5 °F

  • Average 2020–2025

    46.7 °F

  • Average High 2020–2025

    54.8 °F
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