Port Jefferson Weather Forecast

    • 74
    • 86

    Slight Chance Thunderstorms

    • 72
    • 86

    Mostly Sunny

    • 75
    • 86

    Mostly Sunny

    • 71
    • 86

    Chance Rain Showers

    • 71
    • 83

    Chance Rain Showers

    • 70
    • 83

    Slight Chance Rain Showers

Today 8 Aug Northwest Suffolk

Partly sunny with a slight chance of Showers and Thunderstorms. Highs around 90. Southwest Winds around 10 Mph. Chance of rain 20 percent. Heat index Values in the upper 90s.

Tonight 8 Aug Northwest Suffolk

Partly cloudy with a chance of Thunderstorms with a slight chance of Showers in the Evening, then mostly clear after midnight. Some Thunderstorms may be severe with damaging Winds. Humid with Lows in the mid 70s. Southwest Winds 5 to 10 Mph. Chance of rain 30 percent.

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Port Jefferson Temperature Statistics

August Temperature

Islip, Long Island Mac Arthur Airport (10.6 miles)

  • Lowest 4 August, 2026

    63.6 °F

  • Average August

    76.5 °F

  • Highest 6 August, 2026

    87.1 °F

Climate (2021–2026)

Islip, Long Island Mac Arthur Airport (10.6 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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