Great South Bay Weather Forecast

    • 71
    • 78

    Becoming Sunny

    • 75
    • 84

    Breezy

    • 74
    • 88

    Mostly Sunny

    • 73
    • 82

    Partly Sunny

    • 72
    • 80

    Slight Chance Rain Showers

    • 71
    • 79

    Chance Rain Showers

Today 13 Jul Southwest Suffolk

Sunny. Highs in the lower 80s. Southwest Winds 10 to 15 Mph.

Tonight 13 Jul Southwest Suffolk

Mostly clear. Lows around 70. Southwest Winds 10 to 15 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

    77 °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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