Great South Bay Weather Forecast

    • 69
    • 76

    Rain Showers

    • 70
    • 73

    Chance Rain Showers

    • 72
    • 77

    Chance Rain Showers

    • 69
    • 79

    Mostly Sunny

    • 66
    • 74

    Mostly Sunny

    • 66
    • 72

    Mostly Sunny

Today 1 Sep Southwest Suffolk

Mostly cloudy. A slight chance of Showers Early, then a chance of Showers. A slight chance of Thunderstorms this afternoon. Humid with Highs in the upper 70s. South Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 1 Sep Southwest Suffolk

Mostly cloudy. Showers with a chance of Thunderstorms in the Evening, then a chance of Showers after midnight. Some Thunderstorms may be severe. Humid with Lows in the upper 60s. East Winds 5 to 10 Mph. Gusts up to 20 Mph after midnight. Chance of rain 90 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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