Port Jefferson Weather Forecast

    • 73
    • 82

    Slight Chance Thunderstorms

    • 74
    • 84

    Chance Thunderstorms

    • 76
    • 85

    Rain Showers Likely

    • 69
    • 85

    Chance Thunderstorms

    • 70
    • 80

    Partly Sunny

    • 71
    • 81

    Chance Rain Showers

    • 69
    • 81

    Chance Rain Showers

Today 15 Jul Northwest Suffolk

Sunny with a slight chance of Showers and Thunderstorms. Near steady temperature in the mid 80s. South Winds around 5 Mph. Chance of rain 20 percent. Heat index Values in the mid 90s.

Tonight 15 Jul Northwest Suffolk

Mostly clear this Evening, then becoming partly cloudy. Patchy fog after midnight. Lows in the lower 70s. South Winds around 5 Mph.

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Port Jefferson Temperature Statistics

July Temperature

Islip, Long Island Mac Arthur Airport (10.6 miles)

  • Lowest 5 July, 2025

    64.7 °F
  • Average July

    77.3 °F
  • Highest 8 July, 2025

    92.6 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (10.6 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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