Port Jefferson Weather Forecast

    • 28
    • 41

    Decreasing Clouds

    • 37
    • 41

    Partly Sunny

    • 43
    • 48

    Partly Sunny

    • 46
    • 52

    Partly Sunny

    • 44
    • 59

    Rain

    • 38
    • 48

    Chance Rain Showers

Today 6 Dec Northwest Suffolk

Mostly cloudy with a slight chance of rain and snow Showers in the Morning, then partly sunny in the afternoon. Highs around 40. North Winds 10 to 15 Mph. Chance of precipitation 20 percent.

Tonight 6 Dec Northwest Suffolk

Partly cloudy in the Evening, then clearing. Lows in the mid 20s. Northwest Winds 10 to 15 Mph.

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Port Jefferson Temperature Statistics

December Temperature

Islip, Long Island Mac Arthur Airport (10.6 miles)

  • Lowest 1 December, 2023

    39.9 °F

  • Average December

    47.6 °F

  • Highest 2 December, 2023

    53.1 °F

Climate (2018–Present)

Islip, Long Island Mac Arthur Airport (10.6 miles)

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  • Average Low 2018–2023

    47.3 °F

  • Average 2018–2023

    55 °F

  • Average High 2018–2023

    62.5 °F
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