Setauket Harbor Weather Forecast

    • 56
    • 64

    Becoming Sunny

    • 59
    • 70

    Rain Showers

    • 53
    • 67

    Rain Showers Likely

    • 56
    • 67

    Chance Rain Showers

    • 49
    • 66

    Slight Chance Rain Showers

    • 48
    • 60

    Partly Sunny

    • 49
    • 60

    Partly Sunny

Today 18 Oct Northwest Suffolk

Mostly sunny. Near steady temperature in the mid 60s. West Winds around 5 Mph.

Tonight 18 Oct Northwest Suffolk

Partly cloudy in the Evening, then becoming mostly clear. Patchy fog after midnight. Lows in the lower 50s. South Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Setauket Harbor Temperature Statistics

October Temperature

Islip, Long Island Mac Arthur Airport (10.6 miles)

  • Lowest 10 October, 2025

    42.1 °F

  • Average October

    62 °F

  • Highest 4 October, 2025

    82 °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

    55.3 °F

  • Average High 2020–2025

    63.2 °F
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