Great South Bay Weather Forecast

    • 49
    • 66

    Mostly Sunny

    • 43
    • 57

    Partly Sunny

    • 53
    • 59

    Partly Sunny

    • 56
    • 62

    Mostly Cloudy

    • 57
    • 63

    Mostly Cloudy

    • 58
    • 63

    Mostly Cloudy

Today 30 Oct Southwest Suffolk

Sunny. Highs in the upper 60s. West Winds 10 to 15 Mph, becoming northwest this afternoon. Gusts up to 25 Mph.

Tonight 30 Oct Southwest Suffolk

Mostly clear. Lows in the lower 40s. Northwest Winds 10 to 15 Mph with Gusts up to 30 Mph.

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Great South Bay Temperature Statistics

October Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 25 October, 2026

    36.6 °F

  • Average October

    58.4 °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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