Sayville Weather Forecast

    • 66
    • 82

    Chance Thunderstorms

    • 62
    • 73

    Slight Chance Rain Showers

    • 64
    • 73

    Chance Rain Showers

    • 63
    • 75

    Chance Rain Showers

    • 65
    • 78

    Partly Sunny

    • 68
    • 80

    Mostly Sunny

Today 17 Aug Southwest Suffolk

Mostly sunny. Highs in the mid 80s. Southwest Winds 10 to 15 Mph. Gusts up to 25 Mph this afternoon.

Tonight 17 Aug Southwest Suffolk

Mostly cloudy. A chance of Showers with a slight chance of Thunderstorms. Some Thunderstorms may produce gusty Winds in the evening. Humid with Lows in the mid 60s. Southwest Winds 10 to 15 Mph, becoming north 15 to 20 Mph with Gusts up to 30 Mph after midnight. Chance of rain 40 percent.

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Sayville Temperature Statistics

August Temperature

Islip, Long Island Mac Arthur Airport (3.7 miles)

  • Lowest 9 August, 2025

    56.6 °F

  • Average August

    74.7 °F

  • Highest 4 August, 2025

    89.7 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (3.7 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    55.2 °F

  • Average High 2020–2025

    63.1 °F
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