Great South Bay Weather Forecast

    • 70
    • 78

    Mostly Sunny

    • 71
    • 78

    Mostly Sunny

    • 76
    • 82

    Mostly Sunny

    • 74
    • 89

    Partly Sunny

    • 74
    • 82

    Partly Sunny

Today 12 Jul Southwest Suffolk

Sunny. Highs in the lower 80s. Northeast Winds around 5 Mph, becoming southeast this afternoon.

Tonight 12 Jul Southwest Suffolk

Clear. Lows in the upper 60s. South Winds 5 to 10 Mph.

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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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