Great South Bay Weather Forecast

    • 73
    • 81

    Areas Smoke

    • 73
    • 78

    Rain Showers

    • 69
    • 80

    Mostly Sunny

    • 71
    • 78

    Partly Sunny

    • 73
    • 80

    Rain Showers Likely

    • 71
    • 81

    Chance Rain Showers

Today 17 Jul Southwest Suffolk

Mostly sunny. Smoke this Morning, then Areas of smoke this afternoon. Highs in the mid 80s. North Winds around 5 Mph, becoming southwest this afternoon.

Tonight 17 Jul Southwest Suffolk

Partly cloudy. Areas of smoke. Lows in the lower 70s. Southwest Winds 5 to 10 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

    76.6 °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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