Bellport Bay - John Boyle Island Weather Forecast

    • 47
    • 51

    Windy

    • 30
    • 55

    Rain Showers

    • 39
    • 45

    Mostly Cloudy

    • 27
    • 46

    Partly Sunny

    • 28
    • 35

    Partly Sunny

    • 36
    • 41

    Chance Rain

Today 18 Dec Southwest Suffolk

Mostly sunny. Highs in the lower 50s. Northwest Winds around 5 Mph, becoming east this Morning, then becoming southeast with Gusts up to 20 Mph this afternoon.

Tonight 18 Dec Southwest Suffolk

A chance of Showers in the Evening, then Showers after midnight. Very windy with Lows in the mid 40s. South Winds 10 to 15 Mph with Gusts up to 30 Mph, increasing to 25 to 35 Mph with Gusts up to 45 Mph after midnight. Chance of rain near 100 percent.

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Bellport Bay - John Boyle Island Temperature Statistics

December Temperature

Shirley, Brookhaven Airport (5.6 miles)

  • Lowest 9 December, 2025

    14 °F

  • Average December

    31.8 °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

    46.4 °F

  • Average 2020–2025

    54.8 °F

  • Average High 2020–2025

    62.8 °F
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