Setauket-East Setauket Weather Forecast

    • 56
    • 63

    Drizzle

    • 58
    • 69

    Partly Sunny

    • 60
    • 72

    Partly Sunny

    • 64
    • 74

    Partly Sunny

    • 60
    • 75

    Slight Chance Rain Showers

    • 57
    • 68

    Mostly Cloudy

Today 28 Sep Northwest Suffolk

Partly sunny. A chance of Showers in the morning. Highs in the mid 60s. Chance of rain 40 percent.

Tonight 28 Sep Northwest Suffolk

Areas of fog this evening. Mostly cloudy with Areas of drizzle this Evening, then partly cloudy after midnight. Lows in the mid 50s. Northwest Winds 5 to 10 Mph. Gusts up to 20 Mph this evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Setauket-East Setauket Temperature Statistics

September Temperature

Islip, Long Island Mac Arthur Airport (9.3 miles)

  • Lowest 15 September, 2026

    52.6 °F

  • Average September

    68.7 °F

  • Highest 10 September, 2026

    86.6 °F

Climate (2021–2026)

Islip, Long Island Mac Arthur Airport (9.3 miles)

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  • Average Low 2021–2026

    47.2 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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