Holtsville Weather Forecast

    • 24
    • 50

    Rain

    • 24
    • 32

    Mostly Cloudy

    • 21
    • 35

    Mostly Cloudy

    • 18
    • 30

    Slight Chance Snow

    • 22
    • 31

    Partly Sunny

    • 25
    • 36

    Chance Snow

Today 29 Dec Southwest Suffolk

Rain, windy and not as cool with Highs in the lower 50s. Southwest Winds 15 to 20 Mph, increasing to 20 to 30 Mph this afternoon. Gusts up to 40 Mph. Chance of rain near 100 percent.

Tonight 29 Dec Southwest Suffolk

Mostly clear in the Evening, then becoming mostly cloudy. Windy with Lows in the mid 20s. West Winds 20 to 30 Mph with Gusts up to 50 Mph.

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Holtsville Temperature Statistics

December Temperature

Islip, Long Island Mac Arthur Airport (3.1 miles)

  • Lowest 15 December, 2025

    19.9 °F

  • Average December

    35.4 °F

  • Highest 19 December, 2025

    57.9 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (3.1 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    55.3 °F

  • Average High 2020–2025

    63.1 °F
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