Castine Weather Forecast

    • 42
    • 61

    Mostly Sunny

    • 51
    • 63

    Mostly Sunny

    • 54
    • 64

    Chance Rain

    • 53
    • 59

    Rain Showers Likely

    • 53
    • 58

    Rain Showers Likely

    • 52
    • 58

    Chance Rain Showers

    • 52
    • 62

    Partly Sunny

Today 23 Sep Coastal Hancock

Partly sunny. Highs in the upper 60s.

Tonight 23 Sep Coastal Hancock

Clear. Lows around 40. Northeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castine Temperature Statistics

September Temperature

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

  • Lowest 20 September, 2026

    41 °F

  • Average September

    59.6 °F

  • Highest 10 September, 2026

    80.1 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    38.2 °F

  • Average 2021–2026

    46.5 °F

  • Average High 2021–2026

    54.6 °F
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