Marine Weather Net

Port Jefferson, NY Weather Forecast




Port Jefferson, New York

 Lat: 40.95N, Lon: 73.06W

Current Conditions Updated: 856 AM EDT MON SEP 14 2026

Mostly Cloudy
Temp: 68°F
  • Humidity:
  • 58%
  • Winds:
  • 10 MPH N
  • Gusts:
  • 22 MPH
  • Barometer:
  • 29.99 in.
  • Dewpoint:
  • 53°F
  • Heat index:
  • 68°F

  • Sunrise:
  • 6:29 AM EDT
  • Sunset:
  • 7:03 PM EDT
  • Moonrise:
  • 10:22 AM EDT
  • Moonset:
  • 8:26 PM EDT

TODAY

PARTLY SUNNY
Hi: 75°F
Lo: 55°F
Precip: 20%

TUESDAY

SUNNY

Hi: 71°F
Lo: 59°F

WEDNESDAY

SUNNY

Hi: 75°F
Lo: 61°F

THURSDAY

MOSTLY SUNNY
Hi: 79°F
Lo: 65°F
Weather Forecast In Detail:
Forecast Issued: 528 AM EDT Mon Sep 14 2026

Today...Partly sunny with a slight chance of showers early, then sunny this afternoon. Highs in the mid 70s. North winds 10 to 15 mph. Gusts up to 30 mph. Chance of rain 20 percent.
Tonight...Clear. Lows in the mid 50s. North winds 10 to 15 mph. Gusts up to 25 mph in the evening.
Tuesday...Sunny. Highs in the lower 70s. East winds 5 to 10 mph.
Tuesday Night...Mostly clear. Lows in the upper 50s. South winds around 5 mph.
Wednesday...Sunny. Highs in the mid 70s. Southwest winds 5 to 10 mph.
Wednesday Night...Partly cloudy. Lows in the lower 60s.
Thursday...Mostly sunny. Highs in the upper 70s.
Thursday Night...Partly cloudy in the evening, then becoming mostly cloudy. Lows in the mid 60s.
Friday...Mostly sunny. Highs in the upper 70s.
Friday Night...Partly cloudy. Lows in the lower 60s.
Saturday...Mostly sunny. Highs in the mid 70s.
Saturday Night...Partly cloudy in the evening, then mostly cloudy with a chance of showers after midnight. Lows in the lower 60s. Chance of rain 30 percent.
Sunday...Partly sunny with a 30 percent chance of showers. Highs in the mid 70s.
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