Stony Brook Weather Forecast

    • 69
    • 83

    Decreasing Clouds

    • 72
    • 83

    Chance Rain Showers

    • 68
    • 87

    Chance Thunderstorms

    • 65
    • 82

    Mostly Sunny

    • 68
    • 81

    Partly Sunny

    • 71
    • 83

    Slight Chance Rain Showers

Today 18 Jul Northwest Suffolk

Mostly sunny. Highs in the mid 80s. Northwest Winds 10 to 15 Mph.

Tonight 18 Jul Northwest Suffolk

Mostly clear. Lows in the lower 70s. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

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Stony Brook Temperature Statistics

July Temperature

Islip, Long Island Mac Arthur Airport (8.7 miles)

  • Lowest 5 July, 2025

    64.7 °F

  • Average July

    77.6 °F

  • Highest 8 July, 2025

    92.6 °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

    55.2 °F

  • Average High 2020–2025

    63 °F
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