Great South Bay Weather Forecast

    • 74
    • 77

    Windy

    • 69
    • 81

    Chance Rain Showers

    • 66
    • 75

    Mostly Sunny

    • 70
    • 73

    Chance Rain Showers

    • 70
    • 76

    Slight Chance Rain Showers

    • 68
    • 76

    Partly Sunny

    • 71
    • 75

    Partly Sunny

Today 9 Sep Southwest Suffolk

Partly sunny. Highs around 80. South Winds 15 to 20 Mph with Gusts up to 35 Mph.

Tonight 9 Sep Southwest Suffolk

Mostly cloudy and breezy. Lows in the lower 70s. Southwest Winds 15 to 25 Mph with Gusts up to 40 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 7 September, 2026

    55.9 °F

  • Average September

    72.5 °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

    47.2 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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