Great South Bay Weather Forecast

    • 70
    • 74

    Rain Showers

    • 70
    • 78

    Chance Rain Showers

    • 68
    • 77

    Mostly Sunny

    • 69
    • 77

    Mostly Sunny

    • 71
    • 77

    Chance Rain Showers

    • 71
    • 77

    Chance Rain Showers

Today 22 Aug Southwest Suffolk

Cloudy with a 20 percent chance of Showers. Highs in the mid 70s. Northeast Winds 5 to 10 Mph, becoming east this afternoon.

Tonight 22 Aug Southwest Suffolk

Mostly cloudy. A chance of Showers in the Evening, then Showers likely with a chance of Thunderstorms after midnight. Patchy fog after midnight. Some Thunderstorms may produce heavy rainfall after midnight. Humid with Lows in the mid 60s. East Winds 5 to 10 Mph. Chance of rain 70 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

    77.6 °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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