Holtsville Weather Forecast

    • 66
    • 82

    Chance Rain Showers

    • 66
    • 85

    Mostly Sunny

    • 70
    • 85

    Mostly Sunny

    • 76
    • 91

    Mostly Sunny

    • 75
    • 93

    Partly Sunny

    • 72
    • 88

    Partly Sunny

Today 11 Jul Southwest Suffolk

Mostly cloudy. Patchy fog early. A slight chance of Showers early. A chance of Showers. A slight chance of Thunderstorms this afternoon. Humid with Highs in the lower 80s. Northeast Winds 5 to 10 Mph, becoming east with Gusts up to 20 Mph this afternoon. Chance of rain 50 percent.

Tonight 11 Jul Southwest Suffolk

Mostly cloudy with a chance of Showers in the Evening, then mostly clear after midnight. Lows in the mid 60s. Northeast Winds 5 to 10 Mph. Chance of rain 30 percent.

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Holtsville Temperature Statistics

July Temperature

Islip, Long Island Mac Arthur Airport (3.1 miles)

  • Lowest 7 July, 2026

    63.6 °F

  • Average July

    76.6 °F

  • Highest 3 July, 2026

    98.7 °F

Climate (2021–2026)

Islip, Long Island Mac Arthur Airport (3.1 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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