Great South Bay Weather Forecast

    • 68
    • 78

    Chance Thunderstorms

    • 69
    • 76

    Partly Sunny

    • 72
    • 77

    Partly Sunny

    • 72
    • 79

    Slight Chance Thunderstorms

    • 72
    • 77

    Chance Rain Showers

    • 72
    • 78

    Chance Rain Showers

Today 28 Aug Southwest Suffolk

Mostly cloudy. Areas of fog this morning. A chance of Showers with a slight chance of Thunderstorms this afternoon. Highs around 80. Southwest Winds 5 to 10 Mph. Chance of rain 40 percent.

Tonight 28 Aug Southwest Suffolk

Mostly cloudy. A chance of Showers and Thunderstorms in the evening. Lows in the lower 60s. West Winds around 5 Mph, becoming north with Gusts up to 20 Mph after midnight. Chance of rain 30 percent.

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Great South Bay Temperature Statistics

August Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 25 August, 2026

    61 °F

  • Average August

    76.1 °F

  • Highest 7 August, 2026

    91.7 °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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