Great South Bay Weather Forecast

    • 71
    • 78

    Partly Sunny

    • 74
    • 78

    Breezy

    • 69
    • 80

    Chance Rain Showers

    • 67
    • 75

    Mostly Sunny

    • 70
    • 74

    Partly Sunny

    • 71
    • 77

    Slight Chance Rain Showers

    • 68
    • 77

    Partly Sunny

Today 8 Sep Southwest Suffolk

Mostly sunny. Near steady temperature in the upper 70s. West Winds 5 to 10 Mph.

Tonight 8 Sep Southwest Suffolk

Partly cloudy. Lows in the upper 60s. Southwest Winds 5 to 10 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 6 September, 2026

    62.1 °F

  • Average September

    73.1 °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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