Holtsville Weather Forecast

    • 31
    • 41

    Rain

    • 32
    • 40

    Rain

    • 31
    • 40

    Rain

    • 29
    • 43

    Chance Snow

    • 27
    • 36

    Snow Likely

    • 23
    • 36

    Chance Snow

    • 23
    • 36

    Mostly Sunny

Today 18 Feb Southwest Suffolk

Rain. Areas of fog. Near steady temperature around 40. East Winds around 5 Mph. Chance of rain 80 percent.

Tonight 18 Feb Southwest Suffolk

Cloudy. Rain likely in the evening. Areas of fog in the Evening, then patchy fog after midnight. Lows in the lower 30s. Northeast Winds 5 to 10 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Holtsville Temperature Statistics

February Temperature

Islip, Long Island Mac Arthur Airport (3.1 miles)

  • Lowest 8 February, 2026

    4.6 °F

  • Average February

    25 °F

  • Highest 14 February, 2026

    42.1 °F

Climate (2021–Present)

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 °F
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