Port Jefferson Harbor Entrance Weather Forecast

    • 55
    • 64

    Becoming Sunny

    • 58
    • 64

    Rain Showers

    • 52
    • 63

    Chance Rain Showers

    • 50
    • 58

    Chance Rain Showers

    • 50
    • 57

    Partly Sunny

    • 52
    • 57

    Partly Sunny

Today 20 Oct Northwest Suffolk

Partly sunny with a 20 percent chance of Showers. Highs in the mid 60s. West Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 20 Oct Northwest Suffolk

Partly cloudy. A slight chance of Showers in the evening. Lows in the upper 40s. West Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 20 percent.

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Port Jefferson Harbor Entrance Temperature Statistics

October Temperature

Islip, Long Island Mac Arthur Airport (11.8 miles)

  • Lowest 10 October, 2025

    42.1 °F

  • Average October

    61.3 °F

  • Highest 4 October, 2025

    82 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (11.8 miles)

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  • Average Low 2020–2025

    47.5 °F

  • Average 2020–2025

    55.3 °F

  • Average High 2020–2025

    63.2 °F
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