Port Jefferson Harbor Weather Forecast

    • 46
    • 53

    Rain Showers Likely

    • 44
    • 62

    Slight Chance Rain Showers

    • 45
    • 55

    Partly Sunny

    • 46
    • 58

    Mostly Sunny

    • 50
    • 58

    Chance Rain Showers

    • 42
    • 58

    Chance Rain Showers

Today 19 Apr Northwest Suffolk

Mostly cloudy in the Morning, then becoming partly sunny. Highs in the mid 50s. East Winds 5 to 10 Mph, becoming southeast in the afternoon.

Tonight 19 Apr Northwest Suffolk

Cloudy. A chance of Showers in the Evening, then Showers likely after midnight. Lows in the mid 40s. South Winds 5 to 10 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Port Jefferson Harbor Temperature Statistics

April Temperature

Islip, Long Island Mac Arthur Airport (11.2 miles)

  • Lowest 5 April, 2024

    35.7 °F

  • Average April

    50.8 °F

  • Highest 15 April, 2024

    78.1 °F

Climate (2019–Present)

Islip, Long Island Mac Arthur Airport (11.2 miles)

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  • Average Low 2019–2024

    47.3 °F

  • Average 2019–2024

    54.9 °F

  • Average High 2019–2024

    62.5 °F
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