Great South Bay Weather Forecast

    • 73
    • 84

    Partly Sunny

    • 73
    • 81

    Chance Thunderstorms

    • 73
    • 81

    Slight Chance Thunderstorms

    • 69
    • 79

    Mostly Sunny

    • 70
    • 76

    Partly Sunny

    • 71
    • 75

    Partly Sunny

Today 11 Aug Southwest Suffolk

Mostly sunny. Humid with Highs in the upper 80s. West Winds 5 to 10 Mph. Gusts up to 20 Mph in the afternoon.

Tonight 11 Aug Southwest Suffolk

Mostly cloudy. A slight chance of Showers after midnight. Humid with Lows around 70. West Winds 5 to 10 Mph, becoming north after midnight. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Great South Bay Temperature Statistics

August Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 4 August, 2026

    63.6 °F

  • Average August

    77.9 °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

    47.3 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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