Great South Bay Weather Forecast

    • 71
    • 73

    Rain Showers Likely

    • 72
    • 79

    Rain Showers Likely

    • 68
    • 80

    Partly Sunny

    • 65
    • 75

    Partly Sunny

    • 65
    • 72

    Mostly Sunny

    • 68
    • 74

    Partly Sunny

Today 2 Sep Southwest Suffolk

Mostly cloudy. Near steady temperature in the lower 70s. East Winds 10 to 15 Mph.

Tonight 2 Sep Southwest Suffolk

Mostly cloudy. A slight chance of Showers in the Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Humid with Lows in the mid 60s. Southeast Winds 10 to 15 Mph. Chance of rain 50 percent.

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Great South Bay Temperature Statistics

September Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

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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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