Great South Bay Weather Forecast

    • 57
    • 71

    Mostly Sunny

    • 63
    • 74

    Mostly Sunny

    • 70
    • 76

    Mostly Cloudy

    • 66
    • 76

    Partly Sunny

    • 68
    • 73

    Chance Rain Showers

    • 66
    • 74

    Chance Rain Showers

Today 15 Sep Southwest Suffolk

Sunny. Highs in the lower 70s. Northeast Winds 5 to 10 Mph, becoming southeast in the afternoon.

Tonight 15 Sep Southwest Suffolk

Partly cloudy. Lows in the upper 50s. South Winds around 5 Mph.

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  • Temperature Real-Time

Great South Bay Temperature Statistics

September Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 7 September, 2026

    56.6 °F

  • Average September

    72.4 °F

  • Highest 10 September, 2026

    86.6 °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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