Great South Bay Weather Forecast

    • 48
    • 66

    Breezy

    • 46
    • 61

    Breezy

    • 46
    • 62

    Breezy

    • 45
    • 54

    Mostly Sunny

    • 49
    • 57

    Mostly Sunny

    • 53
    • 60

    Mostly Sunny

    • 55
    • 63

    Mostly Sunny

Today 20 Oct Southwest Suffolk

Mostly sunny. Highs in the lower 60s.

Tonight 20 Oct Southwest Suffolk

Clear. Lows in the mid 40s. Northeast Winds 15 to 20 Mph with Gusts up to 35 Mph.

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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

    60.7 °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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