Bellport Bay - John Boyle Island Weather Forecast

    • 36
    • 39

    Breezy

    • 33
    • 49

    Rain Likely

    • 27
    • 39

    Partly Sunny

    • 27
    • 37

    Mostly Cloudy

    • 24
    • 38

    Breezy

    • 21
    • 34

    Partly Sunny

Today 9 Dec Southwest Suffolk

Sunny in the Morning, then becoming partly sunny. Highs in the upper 30s. North Winds 5 to 10 Mph, becoming southwest 10 to 15 Mph in the afternoon.

Tonight 9 Dec Southwest Suffolk

Mostly cloudy. A slight chance of rain in the evening. Not as cool with Lows in the lower 30s. Southwest Winds 15 to 20 Mph with Gusts up to 35 Mph. Chance of rain 20 percent.

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Bellport Bay - John Boyle Island Temperature Statistics

December Temperature

Shirley, Brookhaven Airport (5.6 miles)

  • Lowest 5 December, 2025

    18 °F

  • Average December

    33.7 °F

  • Highest 2 December, 2025

    48.9 °F

Climate (2020–Present)

Shirley, Brookhaven Airport (5.6 miles)

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  • Average Low 2020–2025

    46.5 °F

  • Average 2020–2025

    54.8 °F

  • Average High 2020–2025

    62.9 °F
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