Port Jefferson Harbor Weather Forecast

    • 60
    • 79

    Increasing Clouds

    • 58
    • 74

    Sunny

    • 64
    • 79

    Mostly Sunny

    • 67
    • 84

    Chance Rain Showers

    • 71
    • 87

    Slight Chance Thunderstorms

    • 69
    • 86

    Slight Chance Thunderstorms

Today 7 Jun Northwest Suffolk

Sunny. Highs in the lower 80s. West Winds 10 to 15 Mph.

Tonight 7 Jun Northwest Suffolk

Partly cloudy. Lows around 60. North Winds 10 to 15 Mph.

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Port Jefferson Harbor Temperature Statistics

June Temperature

Islip, Long Island Mac Arthur Airport (11.2 miles)

  • Lowest 2 June, 2026

    46.7 °F

  • Average June

    65.9 °F

  • Highest 5 June, 2026

    87.1 °F

Climate (2021–Present)

Islip, Long Island Mac Arthur Airport (11.2 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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