Great South Bay Weather Forecast

    • 64
    • 77

    Mostly Sunny

    • 70
    • 78

    Partly Sunny

    • 73
    • 77

    Chance Rain Showers

    • 70
    • 80

    Partly Sunny

    • 67
    • 75

    Mostly Sunny

    • 69
    • 74

    Mostly Sunny

Today 7 Sep Southwest Suffolk

Sunny. Near steady temperature in the upper 70s. Northwest Winds 5 to 10 Mph.

Tonight 7 Sep Southwest Suffolk

Mostly clear in the Evening, then becoming partly cloudy. Lows in the lower 60s. Northwest Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Great South Bay Temperature Statistics

September Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 2 September, 2026

    65.6 °F

  • Average September

    74.3 °F

  • Highest 3 September, 2026

    85.6 °F

Climate (2021–2026)

Islip, Long Island Mac Arthur Airport (8.1 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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