Great South Bay Weather Forecast

    • 72
    • 81

    Chance Thunderstorms

    • 69
    • 79

    Chance Rain Showers

    • 69
    • 79

    Mostly Sunny

    • 71
    • 79

    Mostly Sunny

    • 75
    • 79

    Mostly Sunny

    • 75
    • 85

    Partly Sunny

Today 10 Jul Southwest Suffolk

Patchy fog this morning. Mostly sunny this Morning, then mostly cloudy with a slight chance of Showers and Thunderstorms this afternoon. Highs in the upper 80s. West Winds 5 to 10 Mph. Chance of rain 20 percent. Heat index Values in the mid 90s.

Tonight 10 Jul Southwest Suffolk

Mostly cloudy. A chance of Showers with a slight chance of Thunderstorms in the Evening, then a slight chance of Showers and Thunderstorms after midnight. Patchy fog after midnight. Humid with Lows around 70. West Winds 5 to 10 Mph, becoming north after midnight. 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 7 July, 2026

    63 °F

  • Average July

    77.5 °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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