Great South Bay Weather Forecast

    • 76
    • 83

    Chance Thunderstorms

    • 73
    • 83

    Partly Sunny

    • 73
    • 80

    Chance Thunderstorms

    • 71
    • 81

    Slight Chance Thunderstorms

    • 69
    • 79

    Mostly Sunny

    • 70
    • 78

    Partly Sunny

Today 10 Aug Southwest Suffolk

Sunny. A slight chance of Showers and Thunderstorms in the afternoon. Humid with Highs in the upper 80s. Southeast Winds around 5 Mph, increasing to southwest 10 to 15 Mph in the afternoon. Chance of rain 20 percent. Heat index Values in the mid 90s.

Tonight 10 Aug Southwest Suffolk

Mostly cloudy with a chance of Showers and Thunderstorms in the Evening, then mostly clear after midnight. Humid with Lows in the mid 70s. West Winds 10 to 15 Mph. Chance of rain 40 percent.

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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

    77.3 °F

  • Highest 7 August, 2026

    89.1 °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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