Great South Bay Weather Forecast

    • 21
    • 34

    Snow

    • 26
    • 31

    Breezy

    • 31
    • 35

    Partly Sunny

    • 36
    • 44

    Partly Sunny

    • 42
    • 51

    Breezy

    • 30
    • 49

    Slight Chance Snow

Today 14 Dec Southwest Suffolk

Snow this Morning, then partly sunny with a slight chance of snow this afternoon. Snow accumulation of 1 to 3 Inches. Highs in the lower 30s. Northwest Winds 15 to 20 Mph. Gusts up to 25 Mph, increasing to 35 Mph this afternoon. Chance of snow near 100 percent.

Tonight 14 Dec Southwest Suffolk

Partly cloudy in the Evening, then clearing. Blustery, cooler with Lows around 18. Northwest Winds 15 to 25 Mph with Gusts up to 40 Mph. Wind chill Values as low as zero.

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Great South Bay Temperature Statistics

December Temperature

Islip, Long Island Mac Arthur Airport (8.1 miles)

  • Lowest 5 December, 2025

    21 °F

  • Average December

    35.6 °F

  • Highest 10 December, 2025

    50 °F

Climate (2020–Present)

Islip, Long Island Mac Arthur Airport (8.1 miles)

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  • Average Low 2020–2025

    47.5 °F

  • Average 2020–2025

    55.3 °F

  • Average High 2020–2025

    63.1 °F
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