Stony Brook Weather Forecast

    • 29
    • 38

    Decreasing Clouds

    • 33
    • 44

    Partly Sunny

    • 37
    • 49

    Chance Rain

    • 38
    • 50

    Chance Rain

    • 38
    • 52

    Chance Rain

    • 29
    • 49

    Mostly Sunny

Today 18 Mar Northwest Suffolk

Mostly sunny. Highs in the upper 30s. Northwest Winds 5 to 10 Mph.

Tonight 18 Mar Northwest Suffolk

Mostly clear. Lows in the upper 20s. South Winds around 5 Mph.

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Stony Brook Temperature Statistics

March Temperature

Islip, Long Island Mac Arthur Airport (8.7 miles)

  • Lowest 3 March, 2026

    18.6 °F

  • Average March

    39.8 °F

  • Highest 9 March, 2026

    66.9 °F

Climate (2021–Present)

Islip, Long Island Mac Arthur Airport (8.7 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    63 °F
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