Great South Bay Weather Forecast

    • 70
    • 77

    Chance Rain Showers

    • 71
    • 76

    Chance Rain Showers

    • 71
    • 78

    Chance Thunderstorms

    • 71
    • 76

    Chance Rain Showers

    • 70
    • 77

    Chance Rain Showers

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    • 77

    Partly Sunny

Today 30 Aug Southwest Suffolk

Partly sunny. A slight chance of Showers this afternoon. Highs in the upper 70s. Southwest Winds 10 to 15 Mph. Gusts up to 25 Mph this afternoon. Chance of rain 20 percent.

Tonight 30 Aug Southwest Suffolk

Showers likely with a chance of Thunderstorms in the Evening, then Showers likely with a slight chance of Thunderstorms after midnight. Humid with Lows in the mid 60s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph, becoming west 5 to 10 Mph after midnight. Chance of rain 60 percent.

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Great South Bay Temperature Statistics

August Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 25 August, 2026

    60.7 °F

  • Average August

    76.1 °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

    47.2 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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