Great South Bay Weather Forecast

    • 72
    • 79

    Rain Showers

    • 66
    • 82

    Mostly Sunny

    • 71
    • 77

    Mostly Sunny

    • 73
    • 79

    Rain Showers

    • 70
    • 80

    Chance Rain Showers

    • 70
    • 78

    Slight Chance Rain Showers

Today 18 Jul Southwest Suffolk

Partly cloudy Early, then Showers with a chance of Thunderstorms. Areas of smoke. Some Thunderstorms may produce heavy rainfall. Humid with Highs around 80. South Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 90 percent.

Tonight 18 Jul Southwest Suffolk

Mostly cloudy. Showers with a chance of Thunderstorms in the Evening, then a chance of Showers and Thunderstorms after midnight. Some Thunderstorms may be severe with damaging Winds and heavy Rainfall, then some Thunderstorms may produce heavy rainfall after midnight. Humid with Lows in the lower 70s. Southwest Winds 15 to 20 Mph with Gusts up to 30 Mph. 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 7 July, 2026

    63.6 °F

  • Average July

    76.9 °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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