Marine Weather Net

Port Jefferson, NY Weather Forecast




Port Jefferson, New York

 Lat: 40.95N, Lon: 73.06W

Current Conditions Updated: 1056 PM EST THU DEC 4 2025

Mostly Clear
Temp: 27°F
  • Humidity:
  • 52%
  • Winds:
  • 12 MPH N
  • Gusts:
  • 23 MPH
  • Barometer:
  • 30.26 in.
  • Dewpoint:
  • 12°F
  • Heat index:
  • 27°F

  • Sunrise:
  • 6:59 AM EST
  • Sunset:
  • 4:23 PM EST
  • Moonrise:
  • 4:50 PM EST
  • Moonset:
  • 8:07 AM EST

TONIGHT

MOSTLY CLEAR
Lo: 16°F

FRIDAY

MOSTLY SUNNY
Hi: 35°F
Lo: 27°F

SATURDAY

PARTLY SUNNY
Hi: 41°F
Lo: 29°F
Precip: 20%

SUNDAY

MOSTLY SUNNY
Hi: 41°F
Lo: 25°F
Weather Forecast In Detail:
Forecast Issued: 1020 PM EST Thu Dec 04 2025

Tonight...Mostly clear. Lows around 16. North winds 15 to 20 mph with gusts up to 35 mph.
Friday...Mostly sunny. Highs in the mid 30s. East winds around 5 mph, becoming southeast in the afternoon.
Friday Night...Mostly cloudy. A chance of snow in the evening, then a chance of rain and snow after midnight. Lows in the upper 20s. East winds around 5 mph, becoming north after midnight. Chance of precipitation 40 percent.
Saturday...Mostly cloudy with a slight chance of rain in the morning, then partly sunny in the afternoon. Highs in the lower 40s. West winds 5 to 10 mph. Chance of rain 20 percent.
Saturday Night...Mostly cloudy in the evening, then clearing. Lows in the upper 20s. West winds 5 to 10 mph.
Sunday...Mostly sunny in the morning, then becoming mostly cloudy. Highs in the lower 40s.
Sunday Night...Mostly cloudy. Lows in the mid 20s.
Monday...Sunny. Highs in the mid 30s.
Monday Night...Mostly clear. Lows around 20.
Tuesday...Mostly sunny in the morning, then becoming mostly cloudy. Highs in the upper 30s.
Tuesday Night...Mostly cloudy. A chance of rain in the evening. Lows around 30. Chance of rain 30 percent.
Wednesday...Mostly cloudy. Highs in the mid 40s.
Wednesday Night...Mostly cloudy with a 50 percent chance of rain. Lows in the lower 30s.
Thursday...Mostly cloudy with a 50 percent chance of rain. Highs in the mid 40s.
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