Stony Brook Weather Forecast

    • 71
    • 90

    Mostly Sunny

    • 73
    • 90

    Chance Thunderstorms

    • 69
    • 88

    Partly Sunny

    • 70
    • 86

    Chance Thunderstorms

    • 66
    • 87

    Slight Chance Thunderstorms

    • 64
    • 82

    Mostly Sunny

    • 65
    • 81

    Partly Sunny

Today 9 Aug Northwest Suffolk

Sunny. Near steady temperature around 90. Northwest Winds 5 to 10 Mph. Heat index Values in the upper 90s.

Tonight 9 Aug Northwest Suffolk

Mostly clear. Lows around 70. West Winds around 5 Mph, becoming north around 5 Mph after midnight.

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Stony Brook Temperature Statistics

August Temperature

Islip, Long Island Mac Arthur Airport (8.7 miles)

  • Lowest 4 August, 2026

    63.6 °F

  • Average August

    77.3 °F

  • Highest 7 August, 2026

    89.1 °F

Climate (2021–2026)

Islip, Long Island Mac Arthur Airport (8.7 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    63.1 °F
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