Bellport Bay - John Boyle Island Weather Forecast

    • 73
    • 84

    Mostly Sunny

    • 75
    • 82

    Chance Rain Showers

    • 71
    • 83

    Partly Sunny

    • 72
    • 80

    Chance Thunderstorms

    • 69
    • 81

    Slight Chance Thunderstorms

    • 67
    • 78

    Mostly Sunny

    • 68
    • 77

    Partly Sunny

Today 9 Aug Southwest Suffolk

Sunny. Near steady temperature in the upper 80s. West Winds 5 to 10 Mph with Gusts up to 20 Mph. Heat index Values in the upper 90s.

Tonight 9 Aug Southwest Suffolk

Mostly clear. Humid with Lows in the lower 70s. West Winds 5 to 10 Mph, becoming north after midnight.

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Bellport Bay - John Boyle Island Temperature Statistics

August Temperature

Shirley, Brookhaven Airport (5.6 miles)

  • Lowest 5 August, 2026

    59 °F

  • Average August

    76.1 °F

  • Highest 7 August, 2026

    89.1 °F

Climate (2021–2026)

Shirley, Brookhaven Airport (5.6 miles)

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  • Average Low 2021–2026

    46.1 °F

  • Average 2021–2026

    54.5 °F

  • Average High 2021–2026

    62.6 °F
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