Stony Brook Weather Forecast

    • 26
    • 35

    Increasing Clouds

    • 28
    • 41

    Snow

    • 18
    • 33

    Snow Likely

    • 23
    • 30

    Mostly Cloudy

    • 26
    • 34

    Mostly Cloudy

    • 35
    • 42

    Mostly Cloudy

Today 12 Dec Northwest Suffolk

Sunny. Highs in the mid 30s. West Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 12 Dec Northwest Suffolk

Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 20s. West Winds 10 to 15 Mph.

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Stony Brook Temperature Statistics

December Temperature

Islip, Long Island Mac Arthur Airport (8.7 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 (8.7 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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