Great South Bay Weather Forecast

    • 70
    • 76

    Rain Showers

    • 68
    • 77

    Rain Showers Likely

    • 70
    • 78

    Partly Sunny

    • 73
    • 79

    Chance Rain Showers

    • 73
    • 82

    Chance Thunderstorms

    • 71
    • 79

    Chance Rain Showers

Today 6 Jul Southwest Suffolk

Showers with a slight chance of Thunderstorms in the Morning, then Showers with a chance of Thunderstorms in the afternoon. Some Thunderstorms may produce heavy rainfall in the morning. Some Thunderstorms may produce heavy rainfall in the afternoon. Humid with Highs in the upper 70s. East Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 90 percent.

Tonight 6 Jul Southwest Suffolk

Showers with a chance of Thunderstorms. Some Thunderstorms may produce heavy rainfall. Humid with Lows in the upper 60s. East Winds 10 to 15 Mph. Gusts up to 30 Mph in the evening. Chance of rain 90 percent.

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Great South Bay Temperature Statistics

July Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 1 July, 2026

    69.7 °F

  • Average July

    82.9 °F

  • Highest 3 July, 2026

    97 °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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