Great South Bay Weather Forecast

    • 73
    • 81

    Rain Showers Likely

    • 73
    • 82

    Partly Sunny

    • 73
    • 82

    Mostly Sunny

    • 70
    • 79

    Chance Thunderstorms

    • 70
    • 77

    Mostly Cloudy

    • 70
    • 77

    Chance Rain Showers

Today 17 Aug Southwest Suffolk

Showers with a slight chance of Thunderstorms this Morning, then mostly sunny this afternoon. Highs in the lower 80s. South Winds 15 to 20 Mph with Gusts up to 30 Mph, becoming northwest 5 to 10 Mph with Gusts up to 20 Mph this afternoon. Chance of rain near 100 percent.

Tonight 17 Aug Southwest Suffolk

Mostly cloudy. Humid with Lows in the lower 70s. North Winds around 5 Mph.

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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

    78.4 °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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