Great South Bay Weather Forecast

    • 75
    • 88

    Slight Chance Thunderstorms

    • 73
    • 83

    Partly Sunny

    • 72
    • 81

    Chance Rain Showers

    • 72
    • 80

    Chance Thunderstorms

    • 71
    • 81

    Chance Rain Showers

    • 72
    • 79

    Chance Rain Showers

Today 15 Jul Southwest Suffolk

Sunny. A slight chance of Showers and Thunderstorms this afternoon. Areas of smoke this afternoon. Highs in the mid 90s. West Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 20 percent. Heat index Values up to 103.

Tonight 15 Jul Southwest Suffolk

Mostly cloudy with a slight chance of Showers and Thunderstorms. Areas of smoke. Lows in the mid 70s. Northwest Winds 10 to 15 Mph, Diminishing to around 5 Mph after midnight. Chance of rain 20 percent.

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  • Temperature Real-Time

Great South Bay Temperature Statistics

July Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 7 July, 2026

    63.6 °F

  • Average July

    76.6 °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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