Great South Bay Weather Forecast

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    • 77

    Chance Rain Showers

    • 71
    • 77

    Rain Showers

    • 70
    • 77

    Chance Rain Showers

    • 69
    • 76

    Slight Chance Thunderstorms

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    • 77

    Partly Sunny

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    • 78

    Partly Sunny

Today 27 Jul Southwest Suffolk

Partly sunny with a slight chance of Showers and Thunderstorms. Near steady temperature in the upper 70s. South Winds 10 to 15 Mph. Chance of rain 20 percent.

Tonight 27 Jul Southwest Suffolk

Partly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then mostly cloudy with a chance of Showers and Thunderstorms after midnight. Humid with Lows in the lower 70s. South Winds 10 to 15 Mph. Chance of rain 40 percent.

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  • Temperature Forecast NOAA

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Great South Bay Temperature Statistics

July Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 24 July, 2026

    58.6 °F

  • Average July

    75.4 °F

  • Highest 3 July, 2026

    98.7 °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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