Bellport Bay - John Boyle Island Weather Forecast

    • 34
    • 37

    Chance Rain/Snow

    • 34
    • 43

    Slight Chance Rain

    • 29
    • 41

    Slight Chance Rain

    • 23
    • 35

    Partly Sunny

    • 35
    • 41

    Chance Rain

    • 38
    • 44

    Chance Rain

Today 5 Dec Southwest Suffolk

Mostly sunny in the Morning, then becoming mostly cloudy. Highs in the mid 30s. Northeast Winds 5 to 10 Mph, becoming southeast in the afternoon.

Tonight 5 Dec Southwest Suffolk

Cloudy. A chance of snow and rain in the Evening, then a chance of rain after midnight. Near steady temperature in the lower 30s. East Winds around 5 Mph, becoming north after midnight. Chance of precipitation 40 percent.

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Bellport Bay - John Boyle Island Temperature Statistics

December Temperature

Shirley, Brookhaven Airport (5.6 miles)

  • Lowest 1 December, 2025

    25 °F

  • Average December

    37 °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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