Siasconset Weather Forecast

    • 66
    • 76

    Rain Showers

    • 58
    • 75

    Mostly Sunny

    • 55
    • 72

    Sunny

    • 65
    • 74

    Mostly Sunny

    • 68
    • 76

    Partly Sunny

    • 69
    • 78

    Chance Rain Showers

Today 20 Jul Nantucket

Showers with a chance of Thunderstorms this Morning, then Showers likely with a chance of Thunderstorms this afternoon. Locally heavy rainfall possible this morning. Highs in the upper 70s. South Winds 10 to 15 Mph. Chance of rain 80 percent.

Tonight 20 Jul Nantucket

Mostly cloudy with a slight chance of Showers with isolated Thunderstorms in the Evening, then partly cloudy after midnight. Humid with Lows in the upper 60s. Southwest Winds 5 to 10 Mph, becoming northwest 10 to 15 Mph after midnight. Chance of rain 20 percent.

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Siasconset Temperature Statistics

July Temperature

Nantucket, Nantucket Memorial Airport (4.3 miles)

  • Lowest 5 July, 2025

    54.6 °F

  • Average July

    70.1 °F

  • Highest 9 July, 2025

    80.7 °F

Climate (2020–Present)

Nantucket, Nantucket Memorial Airport (4.3 miles)

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  • Average Low 2020–2025

    47.7 °F

  • Average 2020–2025

    53.6 °F

  • Average High 2020–2025

    59.4 °F
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