Great South Bay Weather Forecast

    • 58
    • 62

    Rain Showers Likely

    • 49
    • 67

    Mostly Sunny

    • 53
    • 61

    Sunny

    • 58
    • 63

    Mostly Sunny

    • 59
    • 67

    Mostly Sunny

    • 58
    • 67

    Partly Sunny

Today 4 Oct Southwest Suffolk

Partly sunny this Morning, then cloudy with a chance of Showers this afternoon. Highs in the lower 60s. East Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 40 percent.

Tonight 4 Oct Southwest Suffolk

Mostly cloudy. Showers Likely, mainly in the evening. Lows in the mid 50s. Northeast Winds 10 to 15 Mph, becoming north around 5 Mph after midnight. Chance of rain 60 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Great South Bay Temperature Statistics

October Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 1 October, 2026

    60.1 °F

  • Average October

    67.1 °F

  • Highest 1 October, 2026

    73.9 °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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