Nantucket Harbor - First Point Weather Forecast

    • 63
    • 73

    Clearing Late

    • 55
    • 74

    Mostly Sunny

    • 49
    • 68

    Mostly Sunny

    • 57
    • 67

    Partly Sunny

    • 60
    • 70

    Partly Sunny

    • 61
    • 72

    Partly Sunny

Today 18 Sep Nantucket

Mostly cloudy with a slight chance of Showers this Morning, then partly sunny this afternoon. Patchy fog. Highs in the lower 70s. Northeast Winds around 5 Mph, becoming northwest this afternoon. Chance of rain 20 percent.

Tonight 18 Sep Nantucket

Partly cloudy. Patchy fog. Humid. Near steady temperature in the mid 60s. West Winds 10 to 15 Mph.

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Nantucket Harbor - First Point Temperature Statistics

September Temperature

Nantucket, Nantucket Memorial Airport (2.5 miles)

  • Lowest 13 September, 2025

    48 °F

  • Average September

    64.3 °F

  • Highest 6 September, 2025

    75.9 °F

Climate (2020–Present)

Nantucket, Nantucket Memorial Airport (2.5 miles)

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  • Average Low 2020–2025

    47.5 °F

  • Average 2020–2025

    53.6 °F

  • Average High 2020–2025

    59.4 °F
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