Great South Bay Weather Forecast

    • 53
    • 62

    Breezy

    • 50
    • 64

    Breezy

    • 50
    • 59

    Breezy

    • 49
    • 64

    Breezy

    • 49
    • 56

    Mostly Sunny

    • 52
    • 56

    Mostly Sunny

    • 55
    • 61

    Mostly Sunny

Today 19 Oct Southwest Suffolk

Sunny. Highs in the mid 60s.

Tonight 19 Oct Southwest Suffolk

Partly cloudy. Lows in the upper 40s. North Winds 15 to 20 Mph. Gusts up to 30 Mph after midnight.

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  • Temperature Real-Time

Great South Bay Temperature Statistics

October Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 7 October, 2026

    39.7 °F

  • Average October

    61.5 °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

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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