Head of the Harbor Weather Forecast

    • 70
    • 86

    Chance Thunderstorms

    • 67
    • 85

    Mostly Sunny

    • 68
    • 83

    Mostly Sunny

    • 69
    • 88

    Mostly Cloudy

    • 64
    • 84

    Slight Chance Thunderstorms

    • 63
    • 82

    Chance Rain Showers

Today 14 Aug Northwest Suffolk

Patchy fog this morning. Mostly cloudy with a slight chance of Showers this Morning, then partly sunny with a chance of Showers and Thunderstorms this afternoon. Some Thunderstorms may produce heavy rainfall this afternoon. Highs in the upper 80s. Northwest Winds around 5 Mph. Chance of rain 50 percent.

Tonight 14 Aug Northwest Suffolk

Partly cloudy with a chance of Showers and Thunderstorms in the Evening, then mostly clear after midnight. Some Thunderstorms may produce heavy rainfall in the evening. Humid with Lows around 70. West Winds around 5 Mph, becoming north after midnight. Chance of rain 40 percent.

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Head of the Harbor Temperature Statistics

August Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 9 August, 2025

    56.6 °F

  • Average August

    73.1 °F

  • Highest 4 August, 2025

    89.7 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (8.1 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    55.2 °F

  • Average High 2020–2025

    63 °F
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