Great South Bay Weather Forecast

    • 77
    • 82

    Breezy

    • 75
    • 90

    Slight Chance Thunderstorms

    • 74
    • 84

    Partly Sunny

    • 71
    • 83

    Slight Chance Rain Showers

    • 72
    • 79

    Chance Rain Showers

    • 72
    • 80

    Chance Rain Showers

Today 14 Jul Southwest Suffolk

Mostly sunny. Highs in the mid 80s. Southwest Winds 15 to 20 Mph. Gusts up to 25 Mph, increasing to 30 Mph this afternoon.

Tonight 14 Jul Southwest Suffolk

Mostly clear and breezy with Lows in the upper 70s. Southwest Winds 15 to 25 Mph.

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  • Temperature Forecast NOAA

  • 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

    76.8 °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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