Great South Bay Weather Forecast

    • 58
    • 63

    Mostly Sunny

    • 50
    • 67

    Mostly Sunny

    • 50
    • 57

    Partly Sunny

    • 54
    • 60

    Partly Sunny

    • 55
    • 63

    Mostly Cloudy

    • 55
    • 63

    Mostly Cloudy

Today 29 Oct Southwest Suffolk

Sunny. Highs in the mid 60s. Southwest Winds 5 to 10 Mph.

Tonight 29 Oct Southwest Suffolk

Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 50s. Southwest Winds 10 to 15 Mph.

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Great South Bay Temperature Statistics

October Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 24 October, 2026

    37.7 °F

  • Average October

    58.6 °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

    47.1 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    63 °F
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