Great South Bay Weather Forecast

    • 76
    • 83

    Slight Chance Thunderstorms

    • 74
    • 84

    Mostly Sunny

    • 76
    • 83

    Slight Chance Thunderstorms

    • 73
    • 83

    Chance Thunderstorms

    • 73
    • 80

    Chance Rain Showers

    • 72
    • 80

    Slight Chance Thunderstorms

    • 69
    • 79

    Mostly Sunny

Today 8 Aug Southwest Suffolk

Partly sunny with a slight chance of Showers and Thunderstorms. Highs in the upper 80s. Southwest Winds 10 to 15 Mph. Chance of rain 20 percent. Heat index Values in the upper 90s.

Tonight 8 Aug Southwest Suffolk

Partly cloudy with a slight chance of Showers and Thunderstorms early this Evening, then mostly clear after midnight. Lows in the mid 70s. Southwest Winds 5 to 10 Mph. Gusts up to 20 Mph early this 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

    76.5 °F

  • Highest 6 August, 2026

    87.1 °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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