Great South Bay Weather Forecast

    • 73
    • 81

    Increasing Clouds

    • 75
    • 83

    Slight Chance Thunderstorms

    • 76
    • 84

    Chance Rain Showers

    • 76
    • 82

    Slight Chance Thunderstorms

    • 75
    • 83

    Mostly Sunny

    • 75
    • 83

    Chance Rain Showers

Today 5 Aug Southwest Suffolk

Mostly sunny. Highs in the lower 80s. West Winds around 5 Mph, becoming east around 5 Mph this Morning, then becoming south this afternoon.

Tonight 5 Aug Southwest Suffolk

Mostly cloudy. A slight chance of Showers after midnight. Humid with Lows in the lower 70s. South Winds 5 to 10 Mph. 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 3 August, 2026

    70 °F

  • Average August

    77.6 °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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