Holtsville Weather Forecast

    • 56
    • 70

    Chance Thunderstorms

    • 62
    • 69

    Mostly Cloudy

    • 56
    • 75

    Partly Sunny

    • 53
    • 65

    Partly Sunny

    • 46
    • 68

    Rain Showers Likely

    • 39
    • 54

    Slight Chance Rain Showers

Today 12 Oct Southwest Suffolk

Mostly cloudy with a chance of Showers and Thunderstorms this Morning, then sunny this afternoon. Highs around 70. North Winds 15 to 20 Mph. Chance of rain 40 percent.

Tonight 12 Oct Southwest Suffolk

Mostly clear. Lows in the mid 50s. North Winds 5 to 10 Mph.

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  • Temperature Real-Time

Holtsville Temperature Statistics

October Temperature

Islip, Long Island Mac Arthur Airport (3.1 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 (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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