Bellport Bay - John Boyle Island Weather Forecast

    • 61
    • 68

    Rain

    • 56
    • 66

    Rain

    • 60
    • 68

    Mostly Cloudy

    • 61
    • 69

    Mostly Cloudy

    • 64
    • 71

    Mostly Cloudy

    • 58
    • 71

    Mostly Cloudy

Today 27 Sep Southwest Suffolk

Partly sunny with a 30 percent chance of Showers. Highs in the mid 60s.

Tonight 27 Sep Southwest Suffolk

Rain with a slight chance of Thunderstorms. Lows around 60. Northeast Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain near 100 percent.

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Bellport Bay - John Boyle Island Temperature Statistics

September Temperature

Shirley, Brookhaven Airport (5.6 miles)

  • Lowest 15 September, 2026

    48.9 °F

  • Average September

    67 °F

  • Highest 10 September, 2026

    84.9 °F

Climate (2021–2026)

Shirley, Brookhaven Airport (5.6 miles)

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  • Average Low 2021–2026

    46 °F

  • Average 2021–2026

    54.5 °F

  • Average High 2021–2026

    62.5 °F
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