Great South Bay Weather Forecast

    • 74
    • 82

    Slight Chance Thunderstorms

    • 73
    • 82

    Chance Rain Showers

    • 68
    • 81

    Mostly Sunny

    • 70
    • 78

    Partly Sunny

    • 72
    • 78

    Rain Showers Likely

    • 71
    • 79

    Chance Rain Showers

Today 12 Aug Southwest Suffolk

Mostly sunny. Highs in the mid 80s. North Winds 5 to 10 Mph, becoming west with Gusts up to 20 Mph in the afternoon.

Tonight 12 Aug Southwest Suffolk

Partly cloudy. A slight chance of Showers and Thunderstorms after midnight. Lows around 70. West Winds 5 to 10 Mph. Gusts up to 20 Mph in the evening. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • 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

    78.4 °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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