Holtsville Weather Forecast

    • 63
    • 81

    Chance Rain Showers

    • 62
    • 78

    Partly Sunny

    • 69
    • 80

    Partly Sunny

    • 69
    • 82

    Chance Thunderstorms

    • 68
    • 81

    Chance Rain Showers

    • 68
    • 81

    Chance Rain Showers

Today 28 Aug Southwest Suffolk

Mostly cloudy in the Morning, then partly sunny with a chance of Showers with a slight chance of Thunderstorms in the afternoon. Humid with Highs around 80. Southwest Winds 5 to 10 Mph. Chance of rain 30 percent.

Tonight 28 Aug Southwest Suffolk

Mostly cloudy. A chance of Showers with a slight chance of Thunderstorms in the evening. Humid with Lows in the mid 60s. West Winds 5 to 10 Mph, becoming north after midnight. Chance of rain 30 percent.

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Holtsville Temperature Statistics

August Temperature

Islip, Long Island Mac Arthur Airport (3.1 miles)

  • Lowest 25 August, 2026

    61 °F

  • Average August

    76.3 °F

  • Highest 7 August, 2026

    91.7 °F

Climate (2021–2026)

Islip, Long Island Mac Arthur Airport (3.1 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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