Bellport Bay - John Boyle Island Weather Forecast

    • 61
    • 70

    Partly Sunny

    • 62
    • 75

    Partly Sunny

    • 64
    • 74

    Partly Sunny

    • 58
    • 74

    Partly Sunny

    • 58
    • 72

    Chance Rain Showers

    • 59
    • 73

    Slight Chance Rain Showers

    • 58
    • 75

    Partly Sunny

Today 13 Sep Southwest Suffolk

Sunny. Highs in the lower 70s. South Winds around 10 Mph.

Tonight 13 Sep Southwest Suffolk

Partly cloudy. Lows in the lower 60s. Southwest Winds 5 to 10 Mph.

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Bellport Bay - John Boyle Island Temperature Statistics

September Temperature

Shirley, Brookhaven Airport (5.6 miles)

  • Lowest 9 September, 2025

    48.9 °F
  • Average September

    65.1 °F
  • Highest 6 September, 2025

    79 °F

Climate (2020–Present)

Shirley, Brookhaven Airport (5.6 miles)

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  • Average Low 2020–2025

    46.6 °F
  • Average 2020–2025

    54.9 °F
  • Average High 2020–2025

    63 °F
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