Great South Bay Weather Forecast

    • 57
    • 73

    Chance Rain Showers

    • 63
    • 69

    Mostly Sunny

    • 68
    • 72

    Partly Sunny

    • 69
    • 74

    Partly Sunny

    • 66
    • 75

    Mostly Cloudy

    • 66
    • 71

    Chance Rain Showers

Today 14 Sep Southwest Suffolk

Partly sunny. Isolated Showers in the morning. Less humid with Highs in the mid 70s. North Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 20 percent.

Tonight 14 Sep Southwest Suffolk

Clear. Lows in the mid 50s. North Winds 10 to 15 Mph with Gusts up to 25 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

    72.7 °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

    47.3 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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