Great South Bay Weather Forecast

    • 73
    • 81

    Decreasing Clouds

    • 74
    • 82

    Mostly Sunny

    • 71
    • 81

    Chance Thunderstorms

    • 71
    • 78

    Chance Rain Showers

    • 72
    • 77

    Rain Showers Likely

    • 71
    • 79

    Chance Rain Showers

Today 18 Aug Southwest Suffolk

Partly sunny. Highs in the lower 80s. North Winds around 5 Mph, becoming west around 5 Mph this afternoon.

Tonight 18 Aug Southwest Suffolk

Partly cloudy. A slight chance of Showers in the evening. Humid with Lows in the upper 60s. Southwest Winds around 5 Mph, becoming west 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

    78.1 °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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