Great South Bay Weather Forecast

    • 76
    • 82

    Chance Thunderstorms

    • 76
    • 82

    Partly Sunny

    • 75
    • 83

    Mostly Sunny

    • 76
    • 82

    Partly Sunny

    • 74
    • 84

    Chance Rain Showers

    • 74
    • 81

    Chance Rain Showers

    • 72
    • 80

    Partly Sunny

Today 7 Aug Southwest Suffolk

Partly sunny with a slight chance of Showers and Thunderstorms. Near steady temperature in the mid 80s. Southwest Winds around 10 Mph with Gusts up to 20 Mph. Chance of rain 20 percent. Heat index Values up to 100.

Tonight 7 Aug Southwest Suffolk

Mostly cloudy. Showers early this Evening, then a slight chance of Showers after midnight. Near steady temperature in the mid 70s. Southwest Winds 10 to 15 Mph. Chance of rain 80 percent.

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Great South Bay Temperature Statistics

August Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 5 August, 2026

    63 °F

  • Average August

    75.8 °F

  • Highest 1 August, 2026

    83.6 °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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