Great South Bay Weather Forecast

    • 65
    • 79

    Rain Showers Likely

    • 70
    • 75

    Rain Showers

    • 70
    • 78

    Chance Rain Showers

    • 68
    • 78

    Mostly Sunny

    • 70
    • 77

    Mostly Sunny

    • 72
    • 78

    Partly Sunny

Today 21 Aug Southwest Suffolk

Mostly cloudy with a chance of Showers this Morning, then partly sunny with a slight chance of Showers this afternoon. Highs in the upper 70s. North Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 40 percent.

Tonight 21 Aug Southwest Suffolk

Partly cloudy. A slight chance of Showers in the evening. Lows in the mid 60s. Northeast Winds 5 to 10 Mph. Gusts up to 20 Mph in the evening. Chance of rain 20 percent.

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  • 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

    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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