Great South Bay Weather Forecast

    • 67
    • 78

    Chance Rain Showers

    • 65
    • 77

    Mostly Sunny

    • 69
    • 77

    Mostly Sunny

    • 72
    • 77

    Chance Rain Showers

    • 72
    • 78

    Chance Rain Showers

Today 23 Aug Southwest Suffolk

Patchy fog this morning. Mostly cloudy with Showers likely with a chance of Thunderstorms this Morning, then mostly sunny with a chance of Showers and Thunderstorms this afternoon. Some Thunderstorms may produce gusty Winds, small Hail, and heavy rainfall. Highs in the upper 70s. Southeast Winds 5 to 10 Mph, becoming south with Gusts up to 20 Mph this afternoon. Chance of rain 70 percent.

Tonight 23 Aug Southwest Suffolk

Mostly clear. Lows in the mid 60s. Southwest Winds 10 to 15 Mph.

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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

    77.4 °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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