Great South Bay Weather Forecast

    • 44
    • 61

    Sunny

    • 53
    • 64

    Mostly Sunny

    • 47
    • 57

    Mostly Sunny

    • 53
    • 58

    Partly Sunny

    • 57
    • 63

    Mostly Sunny

    • 56
    • 65

    Mostly Sunny

Today 25 Oct Southwest Suffolk

Sunny. Highs in the lower 60s. North Winds around 5 Mph, becoming west around 5 Mph in the afternoon.

Tonight 25 Oct Southwest Suffolk

Clear. Lows in the lower 40s. West Winds 5 to 10 Mph.

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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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