Port Jefferson Harbor Entrance Weather Forecast

    • 66
    • 79

    Sunny

    • 68
    • 78

    Mostly Sunny

    • 70
    • 78

    Rain Showers

    • 66
    • 82

    Rain Showers Likely

    • 66
    • 76

    Mostly Sunny

    • 69
    • 77

    Partly Sunny

    • 68
    • 79

    Partly Sunny

Today 19 Jul Northwest Suffolk

Sunny. Near steady temperature around 80. Northwest Winds 10 to 15 Mph.

Tonight 19 Jul Northwest Suffolk

Clear. Lows in the lower 60s. North Winds around 5 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Port Jefferson Harbor Entrance Temperature Statistics

July Temperature

Islip, Long Island Mac Arthur Airport (11.8 miles)

  • Lowest 7 July, 2026

    63.6 °F

  • Average July

    77 °F

  • Highest 3 July, 2026

    98.7 °F

Climate (2021–2026)

Islip, Long Island Mac Arthur Airport (11.8 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
Get WillyWeather+ to remove ads