Great South Bay Weather Forecast

    • 45
    • 56

    Mostly Sunny

    • 47
    • 61

    Breezy

    • 51
    • 63

    Windy

    • 50
    • 58

    Slight Chance Rain Showers

    • 52
    • 62

    Slight Chance Rain Showers

    • 49
    • 58

    Breezy

    • 49
    • 55

    Partly Sunny

Today 18 Oct Southwest Suffolk

Mostly sunny. Highs around 60.

Tonight 18 Oct Southwest Suffolk

Mostly clear. Lows in the lower 40s. Northeast Winds 5 to 10 Mph. Gusts up to 20 Mph after midnight.

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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

    62.2 °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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