Great South Bay Weather Forecast

    • 73
    • 79

    Chance Rain Showers

    • 73
    • 82

    Chance Rain Showers

    • 70
    • 82

    Mostly Sunny

    • 71
    • 81

    Partly Sunny

    • 72
    • 77

    Partly Sunny

    • 75
    • 80

    Mostly Sunny

Today 9 Jul Southwest Suffolk

Partly sunny. A chance of Thunderstorms in the afternoon. Some Thunderstorms may produce gusty Winds and heavy rainfall in the afternoon. Humid with Highs in the lower 80s. Southwest Winds 5 to 10 Mph, increasing to 15 to 20 Mph in the afternoon. Chance of precipitation 30 percent.

Tonight 9 Jul Southwest Suffolk

Mostly cloudy. A slight chance of Showers and Thunderstorms in the Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Some Thunderstorms may produce gusty Winds and heavy rainfall in the evening. Humid with Lows in the lower 70s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 30 percent.

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Great South Bay Temperature Statistics

July Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 6 July, 2026

    64.9 °F

  • Average July

    79.4 °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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