Great South Bay Weather Forecast

    • 67
    • 77

    Mostly Sunny

    • 68
    • 78

    Mostly Sunny

    • 72
    • 77

    Partly Sunny

    • 72
    • 78

    Rain Showers Likely

    • 71
    • 79

    Slight Chance Rain Showers

    • 70
    • 79

    Partly Sunny

Today 24 Aug Southwest Suffolk

Sunny Early, then becoming mostly sunny. A slight chance of Showers and Thunderstorms this afternoon. Highs around 80. Southwest Winds 10 to 15 Mph. Chance of rain 20 percent.

Tonight 24 Aug Southwest Suffolk

Partly cloudy with a slight chance of Showers in the Evening, then clear after midnight. Lows in the lower 60s. West Winds 5 to 10 Mph. Gusts up to 20 Mph in the evening. Chance of rain 20 percent.

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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

    76.7 °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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