Port Jefferson Harbor Weather Forecast

    • 48
    • 65

    Partly Sunny

    • 44
    • 58

    Partly Sunny

    • 43
    • 50

    Chance Rain Showers

    • 45
    • 54

    Slight Chance Rain Showers

    • 46
    • 56

    Chance Rain Showers

    • 48
    • 56

    Rain Showers Likely

Today 23 Apr Northwest Suffolk

Patchy fog this morning. Sunny. Not as cool with Highs in the lower 70s. Northwest Winds 5 to 10 Mph. Gusts up to 25 Mph this afternoon.

Tonight 23 Apr Northwest Suffolk

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the upper 40s. North Winds 5 to 10 Mph. Gusts up to 20 Mph in the evening.

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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 9 April, 2026

    27.6 °F

  • Average April

    52.5 °F

  • Highest 16 April, 2026

    82.7 °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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