Siasconset Weather Forecast

    • 57
    • 63

    Partly Sunny

    • 59
    • 66

    Rain Showers Likely

    • 57
    • 65

    Chance Rain Showers

    • 56
    • 63

    Chance Rain Showers

    • 56
    • 63

    Chance Rain Showers

    • 57
    • 63

    Chance Rain Showers

Today 19 Sep Nantucket

Mostly sunny. Cooler with Highs in the mid 60s. Temperature falling into the upper 50s in the afternoon. Northeast Winds 15 to 20 Mph.

Tonight 19 Sep Nantucket

Partly cloudy. Lows in the upper 40s. East Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Siasconset Temperature Statistics

September Temperature

Nantucket, Nantucket Memorial Airport (4.3 miles)

  • Lowest 15 September, 2026

    50 °F

  • Average September

    66.3 °F

  • Highest 4 September, 2026

    78.1 °F

Climate (2021–2026)

Nantucket, Nantucket Memorial Airport (4.3 miles)

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  • Average Low 2021–2026

    46.8 °F

  • Average 2021–2026

    53 °F

  • Average High 2021–2026

    58.8 °F
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