Port Jefferson Harbor Entrance Weather Forecast

    • 72
    • 85

    Chance Thunderstorms

    • 68
    • 82

    Mostly Sunny

    • 71
    • 79

    Chance Thunderstorms

    • 69
    • 79

    Chance Thunderstorms

    • 70
    • 80

    Partly Sunny

    • 71
    • 80

    Slight Chance Rain Showers

Today 17 Jul Northwest Suffolk

Patchy fog in the morning. Partly sunny with a chance of Showers and Thunderstorms. Some Thunderstorms may produce gusty Winds and heavy rainfall. Humid with Highs around 90. Southwest Winds 10 to 15 Mph. Chance of rain 50 percent. Heat index Values up to 102.

Tonight 17 Jul Northwest Suffolk

Partly cloudy. A chance of Showers and Thunderstorms in the evening. Some Thunderstorms may produce gusty Winds and heavy rainfall in the evening. Humid with Lows in the lower 70s. Southwest Winds 10 to 15 Mph, becoming west 5 to 10 Mph after midnight. Chance of rain 40 percent.

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Port Jefferson Harbor Entrance Temperature Statistics

July Temperature

Islip, Long Island Mac Arthur Airport (11.8 miles)

  • Lowest 5 July, 2025

    64.7 °F

  • Average July

    77.4 °F

  • Highest 8 July, 2025

    92.6 °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

    55.2 °F

  • Average High 2020–2025

    63 °F
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