Great South Bay Weather Forecast

    • 49
    • 64

    Sunny

    • 45
    • 58

    Mostly Sunny

    • 54
    • 60

    Partly Sunny

    • 58
    • 64

    Mostly Sunny

    • 57
    • 67

    Mostly Sunny

    • 57
    • 64

    Mostly Cloudy

Today 26 Oct Southwest Suffolk

Sunny. Highs in the upper 60s. West Winds 5 to 10 Mph.

Tonight 26 Oct Southwest Suffolk

Mostly clear. Lows around 50. West Winds 5 to 10 Mph, becoming north 10 to 15 Mph after midnight.

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Great South Bay Temperature Statistics

October Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 19 October, 2026

    38.6 °F

  • Average October

    59.5 °F

  • Highest 14 October, 2026

    82.7 °F

Climate (2021–2026)

Islip, Long Island Mac Arthur Airport (8.1 miles)

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  • Average Low 2021–2026

    47.2 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    63 °F
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