Great South Bay Weather Forecast

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    Chance Rain

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    Windy

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    Chance Rain Showers

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    Chance Rain Showers

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    Chance Rain Showers

Today 22 Sep Southwest Suffolk

Mostly cloudy. Highs in the upper 60s. Northeast Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 22 Sep Southwest Suffolk

Mostly cloudy and breezy. Lows in the mid 50s. Northeast Winds 20 to 25 Mph with Gusts up to 35 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

    70.8 °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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