Holbrook Weather Forecast

    • 63
    • 71

    Rain Showers Likely

    • 62
    • 79

    Gradual Clearing

    • 57
    • 81

    Mostly Sunny

    • 55
    • 71

    Mostly Sunny

    • 57
    • 70

    Partly Sunny

    • 60
    • 74

    Partly Sunny

    • 62
    • 77

    Partly Sunny

Today 17 Sep Southwest Suffolk

Showers likely with a chance of Thunderstorms. Near steady temperature in the upper 60s. East Winds 15 to 20 Mph. Chance of rain 70 percent.

Tonight 17 Sep Southwest Suffolk

Mostly cloudy with a chance of Showers with a slight chance of Thunderstorms. Patchy fog. Lows in the lower 60s. Northeast Winds 10 to 15 Mph. Gusts up to 25 Mph this evening. Chance of rain 50 percent.

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Holbrook Temperature Statistics

September Temperature

Islip, Long Island Mac Arthur Airport (1.2 miles)

  • Lowest 9 September, 2025

    54 °F

  • Average September

    69.3 °F

  • Highest 6 September, 2025

    81 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (1.2 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    55.2 °F

  • Average High 2020–2025

    63.1 °F
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