Holtsville Weather Forecast

    • 50
    • 61

    Rain

    • 56
    • 62

    Rain Showers

    • 59
    • 78

    Chance Rain Showers

    • 59
    • 77

    Mostly Cloudy

    • 60
    • 81

    Partly Sunny

    • 56
    • 76

    Partly Sunny

Today 23 May Southwest Suffolk

Cloudy with a 50 percent chance of rain. Highs in the upper 50s. East Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 23 May Southwest Suffolk

Rain, breezy with Lows around 50. East Winds 15 to 25 Mph with Gusts up to 35 Mph. Chance of rain near 100 percent.

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Holtsville Temperature Statistics

May Temperature

Islip, Long Island Mac Arthur Airport (3.1 miles)

  • Lowest 1 May, 2026

    40.6 °F

  • Average May

    59.7 °F

  • Highest 20 May, 2026

    91 °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

    55.1 °F

  • Average High 2021–2026

    63 °F
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