Bellport Bay - John Boyle Island Weather Forecast

    • 68
    • 72

    Chance Rain Showers

    • 71
    • 74

    Mostly Sunny

    • 62
    • 78

    Rain Showers Likely

    • 58
    • 71

    Chance Rain Showers

    • 57
    • 72

    Mostly Sunny

    • 58
    • 71

    Partly Sunny

    • 58
    • 70

    Partly Sunny

Today 4 Sep Southwest Suffolk

Sunny. Near steady temperature in the lower 70s. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 4 Sep Southwest Suffolk

Mostly cloudy with a chance of Showers with a slight chance of Thunderstorms. Breezy with Lows in the mid 60s. South Winds 15 to 25 Mph with Gusts up to 35 Mph. Chance of rain 50 percent.

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Bellport Bay - John Boyle Island Temperature Statistics

September Temperature

Shirley, Brookhaven Airport (5.6 miles)

  • Lowest 1 September, 2025

    52 °F

  • Average September

    63.5 °F

  • Highest 2 September, 2025

    73.9 °F

Climate (2020–Present)

Shirley, Brookhaven Airport (5.6 miles)

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  • Average Low 2020–2025

    46.6 °F

  • Average 2020–2025

    55 °F

  • Average High 2020–2025

    63 °F
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