Port Jefferson Harbor Entrance Weather Forecast

    • 62
    • 79

    Mostly Sunny

    • 67
    • 83

    Partly Sunny

    • 67
    • 85

    Chance Rain Showers

    • 58
    • 75

    Rain Showers Likely

    • 58
    • 68

    Slight Chance Rain Showers

    • 60
    • 70

    Partly Sunny

Today 4 Jun Northwest Suffolk

Sunny. Highs in the mid 80s. West Winds 5 to 10 Mph.

Tonight 4 Jun Northwest Suffolk

Mostly clear. Lows in the lower 60s. Southwest Winds 5 to 10 Mph.

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Port Jefferson Harbor Entrance Temperature Statistics

June Temperature

Islip, Long Island Mac Arthur Airport (11.8 miles)

  • Lowest 1 June, 2026

    48.9 °F

  • Average June

    59.5 °F

  • Highest 1 June, 2026

    66.9 °F

Climate (2021–Present)

Islip, Long Island Mac Arthur Airport (11.8 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    63 °F
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