Great South Bay Weather Forecast

    • 68
    • 78

    Increasing Clouds

    • 71
    • 78

    Rain Showers

    • 65
    • 80

    Chance Rain Showers

    • 69
    • 78

    Mostly Sunny

    • 70
    • 73

    Partly Sunny

    • 71
    • 74

    Partly Sunny

Today 20 Jul Southwest Suffolk

Sunny. Highs in the upper 70s. Northeast Winds around 5 Mph, becoming south this afternoon.

Tonight 20 Jul Southwest Suffolk

Clear in the Evening, then becoming partly cloudy. Lows in the upper 60s. South Winds 5 to 10 Mph. Gusts up to 20 Mph after midnight.

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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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