Head of the Harbor Weather Forecast

    • 58
    • 72

    Slight Chance Rain Showers

    • 60
    • 77

    Mostly Sunny

    • 64
    • 80

    Partly Sunny

    • 70
    • 79

    Slight Chance Rain Showers

    • 62
    • 83

    Partly Sunny

    • 59
    • 75

    Mostly Sunny

Today 6 Sep Northwest Suffolk

Partly sunny with a 20 percent chance of Showers. Highs in the lower 70s. Northeast Winds 5 to 10 Mph.

Tonight 6 Sep Northwest Suffolk

Mostly clear. Lows in the upper 50s. Northwest Winds around 5 Mph.

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Head of the Harbor Temperature Statistics

September Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 2 September, 2026

    65.6 °F

  • Average September

    72.9 °F

  • Highest 3 September, 2026

    84 °F

Climate (2021–2026)

Islip, Long Island Mac Arthur Airport (8.1 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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