South Setauket Weather Forecast

    • 68
    • 85

    Chance Rain Showers

    • 72
    • 82

    Chance Rain Showers

    • 73
    • 91

    Mostly Sunny

    • 74
    • 94

    Mostly Sunny

    • 72
    • 92

    Chance Rain Showers

    • 67
    • 83

    Chance Rain Showers

    • 64
    • 82

    Mostly Sunny

Today 26 Jul Northwest Suffolk

Mostly sunny. Hazy. Near steady temperature in the lower 80s. Southeast Winds 5 to 10 Mph.

Tonight 26 Jul Northwest Suffolk

Mostly cloudy. Lows in the upper 60s. South Winds 5 to 10 Mph.

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South Setauket Temperature Statistics

July Temperature

Islip, Long Island Mac Arthur Airport (6.2 miles)

  • Lowest 23 July, 2025

    63.6 °F

  • Average July

    78 °F

  • Highest 8 July, 2025

    92.6 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (6.2 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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