Great South Bay Weather Forecast

    • 60
    • 65

    Rain

    • 59
    • 67

    Chance Rain

    • 63
    • 66

    Partly Sunny

    • 55
    • 70

    Partly Sunny

    • 54
    • 62

    Mostly Cloudy

    • 54
    • 64

    Chance Rain Showers

Today 11 Oct Southwest Suffolk

Mostly sunny and breezy. Highs in the mid 50s.

Tonight 11 Oct Southwest Suffolk

Rain with a chance of Thunderstorms. Breezy with Lows in the mid 50s. East Winds 20 to 25 Mph, becoming northeast 10 to 15 Mph after midnight. Chance of rain near 100 percent.

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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 °F

  • Highest 2 October, 2026

    79.6 °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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