Port Jefferson Harbor Entrance Weather Forecast

    • 58
    • 67

    Mostly Sunny

    • 59
    • 65

    Mostly Sunny

    • 57
    • 61

    Mostly Cloudy

    • 53
    • 61

    Chance Rain

    • 53
    • 61

    Mostly Cloudy

    • 56
    • 62

    Chance Rain

Today 29 Sep Northwest Suffolk

Mostly sunny. Highs in the upper 60s. North 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 24 September, 2022

    48 °F
  • Average September

    69.2 °F
  • Highest 1 September, 2022

    87.1 °F

Climate (2010–Present)

Islip, Long Island Mac Arthur Airport (11.8 miles)

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  • Average Low 2010–Present

    47.8 °F
  • Average 2010–Present

    55.2 °F
  • Average High 2010–Present

    62.6 °F
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