Stony Brook Weather Forecast

    • 13
    • 23

    Mostly Cloudy

    • 9
    • 23

    Mostly Sunny

    • 6
    • 19

    Mostly Sunny

    • 15
    • 21

    Chance Snow

    • 18
    • 27

    Chance Snow

    • 20
    • 33

    Partly Sunny

Today 28 Jan Northwest Suffolk

Partly sunny. Cold with Highs in the lower 20s. West Winds 5 to 10 Mph.

Tonight 28 Jan Northwest Suffolk

Mostly cloudy. A slight chance of snow in the evening. Lows around 11. West Winds 5 to 10 Mph, becoming northwest after midnight. Chance of snow 20 percent. Wind chill Values as low as zero.

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Stony Brook Temperature Statistics

January Temperature

Islip, Long Island Mac Arthur Airport (8.7 miles)

  • Lowest 21 January, 2026

    8.7 °F

  • Average January

    33 °F

  • Highest 9 January, 2026

    51.7 °F

Climate (2021–Present)

Islip, Long Island Mac Arthur Airport (8.7 miles)

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  • Average Low 2021–2026

    47.4 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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