Great South Bay Weather Forecast

    • 66
    • 83

    Partly Sunny

    • 73
    • 78

    Chance Thunderstorms

    • 71
    • 81

    Chance Thunderstorms

    • 67
    • 79

    Mostly Sunny

    • 70
    • 75

    Partly Sunny

    • 72
    • 78

    Partly Sunny

    • 74
    • 80

    Chance Rain Showers

Today 18 Jul Southwest Suffolk

Partly sunny. Highs in the lower 80s. Northwest Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 18 Jul Southwest Suffolk

Partly cloudy in the Evening, then clearing. Lows in the mid 60s. Northwest Winds around 5 Mph.

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Great South Bay Temperature Statistics

July Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 5 July, 2025

    64.7 °F

  • Average July

    77.6 °F

  • Highest 8 July, 2025

    92.6 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (8.1 miles)

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  • Average Low 2020–2025

    47.5 °F

  • Average 2020–2025

    55.2 °F

  • Average High 2020–2025

    63 °F
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