Great South Bay Weather Forecast

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    • 66

    Breezy

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    Slight Chance Rain Showers

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    Chance Rain Showers

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    Chance Rain Showers

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    Chance Rain Showers

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    Slight Chance Rain Showers

Today 23 Sep Southwest Suffolk

Mostly sunny. Highs around 70.

Tonight 23 Sep Southwest Suffolk

Partly cloudy and breezy. Lows in the mid 50s. Northeast 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 15 September, 2026

    52.6 °F

  • Average September

    70.4 °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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