Port Jefferson Harbor Entrance Weather Forecast

    • 71
    • 77

    Chance Rain Showers

    • 68
    • 78

    Rain Showers

    • 63
    • 73

    Rain Showers Likely

    • 63
    • 72

    Partly Sunny

    • 63
    • 72

    Mostly Sunny

    • 63
    • 72

    Partly Sunny

    • 62
    • 73

    Slight Chance Rain Showers

Today 22 Sep Northwest Suffolk

Mostly cloudy with a 40 percent chance of Showers. Highs in the upper 70s. South Winds 10 to 15 Mph.

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Port Jefferson Harbor Entrance Temperature Statistics

September Temperature

Islip, Long Island Mac Arthur Airport (11.8 miles)

  • Lowest 11 September, 2021

    54 °F

  • Average September

    70.7 °F

  • Highest 13 September, 2021

    84 °F

Climate (2010–Present)

Islip, Long Island Mac Arthur Airport (11.8 miles)

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  • Average Low 2010–Present

    47.5 °F

  • Average 2010–Present

    54.7 °F

  • Average High 2010–Present

    62 °F
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