Stony Brook Weather Forecast

    • 67
    • 80

    Becoming Sunny

    • 71
    • 86

    Mostly Sunny

    • 74
    • 88

    Mostly Sunny

    • 75
    • 91

    Slight Chance Thunderstorms

    • 73
    • 88

    Chance Rain Showers

    • 71
    • 84

    Chance Thunderstorms

Today 22 Jul Northwest Suffolk

Mostly sunny. Highs around 80. East Winds 5 to 10 Mph.

Tonight 22 Jul Northwest Suffolk

Mostly clear. Lows in the mid 60s. Southeast Winds around 5 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

    78.3 °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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