Central Islip Weather Forecast

    • 19
    • 29

    Increasing Clouds

    • 23
    • 32

    Partly Sunny

    • 29
    • 43

    Partly Sunny

    • 47
    • 52

    Rain

    • 23
    • 51

    Partly Sunny

    • 33
    • 42

    Chance Rain

Today 15 Dec Southwest Suffolk

Mostly sunny. Cold with Highs in the upper 20s. Northwest Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 15 Dec Southwest Suffolk

Mostly cloudy. A slight chance of snow Showers in the evening. Lows around 20. West Winds 10 to 15 Mph. Chance of snow 20 percent.

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Central Islip Temperature Statistics

December Temperature

Islip, Long Island Mac Arthur Airport (5 miles)

  • Lowest 5 December, 2025

    21 °F

  • Average December

    35.2 °F

  • Highest 10 December, 2025

    50 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (5 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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