Great South Bay Weather Forecast

    • 69
    • 77

    Becoming Sunny

    • 68
    • 78

    Mostly Sunny

    • 68
    • 80

    Partly Sunny

    • 70
    • 79

    Partly Sunny

    • 72
    • 77

    Chance Rain Showers

    • 72
    • 79

    Chance Rain Showers

Today 23 Jul Southwest Suffolk

Sunny. Highs in the upper 70s. North Winds around 5 Mph.

Tonight 23 Jul Southwest Suffolk

Clear. Lows in the mid 60s. South Winds around 5 Mph, becoming east after midnight.

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Great South Bay Temperature Statistics

July Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 20 July, 2026

    60.7 °F

  • Average July

    76.1 °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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