Great South Bay Weather Forecast

    • 69
    • 76

    Chance Thunderstorms

    • 68
    • 75

    Chance Rain Showers

    • 71
    • 78

    Partly Sunny

    • 72
    • 78

    Mostly Cloudy

    • 71
    • 77

    Chance Rain Showers

    • 71
    • 78

    Chance Rain Showers

    • 71
    • 79

    Partly Sunny

Today 29 Jul Southwest Suffolk

Mostly cloudy with Showers likely with a chance of Thunderstorms this Morning, then partly sunny with a chance of Showers and Thunderstorms this afternoon. Some Thunderstorms may produce heavy rainfall. Highs in the upper 70s. South Winds 10 to 15 Mph. Gusts up to 30 Mph this morning. Chance of rain 70 percent.

Tonight 29 Jul Southwest Suffolk

Mostly cloudy. A chance of Showers and Thunderstorms this Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Some Thunderstorms may produce heavy rainfall this evening. Some Thunderstorms may produce heavy rainfall after midnight. Lows in the upper 60s. Northwest Winds 5 to 10 Mph. Chance of rain 40 percent.

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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

    75.2 °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

    47.2 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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