Port Jefferson Harbor Weather Forecast

    • 41
    • 55

    Rain Showers Likely

    • 41
    • 54

    Mostly Sunny

    • 44
    • 54

    Mostly Cloudy

    • 47
    • 52

    Rain Likely

    • 32
    • 53

    Chance Rain

    • 37
    • 41

    Mostly Cloudy

Today 8 Mar Northwest Suffolk

Mostly cloudy. Areas of fog this morning. A chance of Showers, mainly this morning. Visibility one quarter mile or less at Times this morning. Not as cool with Highs in the upper 50s. Southwest Winds 10 to 15 Mph. Chance of rain 40 percent.

Tonight 8 Mar Northwest Suffolk

Partly cloudy in the Evening, then clearing. Lows around 40. West Winds 5 to 10 Mph.

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Port Jefferson Harbor Temperature Statistics

March Temperature

Islip, Long Island Mac Arthur Airport (11.2 miles)

  • Lowest 2 March, 2026

    19 °F

  • Average March

    33.3 °F

  • Highest 4 March, 2026

    45 °F

Climate (2021–Present)

Islip, Long Island Mac Arthur Airport (11.2 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    55.1 °F

  • Average High 2021–2026

    63 °F
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