Marine Weather Net

Port Jefferson, NY Weather Forecast




Port Jefferson, New York

 Lat: 40.95N, Lon: 73.06W

Current Conditions Updated: 456 AM EDT WED AUG 5 2026

Clear


Temp: 63°F
  • Humidity:
  • 93%
  • Winds:
  • N/A
  • Gusts:
  • N/A MPH
  • Barometer:
  • 30.13 in.
  • Dewpoint:
  • 61°F
  • Heat index:
  • 63°F

  • Sunrise:
  • 5:50 AM EDT
  • Sunset:
  • 8:02 PM EDT
  • Moonrise:
  • 11:17 PM EDT
  • Moonset:
  • 1:22 PM EDT

TODAY

MOSTLY SUNNY
Hi: 85°F
Lo: 75°F

THURSDAY

PARTLY SUNNY
Hi: 89°F
Lo: 75°F
Precip: 20%

FRIDAY

PARTLY SUNNY
Hi: 89°F
Lo: 71°F
Precip: 50%

SATURDAY

MOSTLY SUNNY
Hi: 89°F
Lo: 71°F
Weather Forecast In Detail:
Forecast Issued: 510 AM EDT Wed Aug 05 2026

Today...Mostly sunny. Highs in the mid 80s. West winds around 5 mph, becoming east this morning, then becoming south around 5 mph this afternoon.
Tonight...Mostly cloudy. A slight chance of showers after midnight. Humid with lows in the lower 70s. South winds 5 to 10 mph. Chance of rain 20 percent.
Thursday...Partly sunny. A slight chance of showers in the morning, then a slight chance of showers and thunderstorms in the afternoon. Humid with highs in the upper 80s. Southwest winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 102.
Thursday Night...Partly cloudy. A chance of showers with a slight chance of thunderstorms in the evening. Humid with lows in the mid 70s. Southwest winds 5 to 10 mph. Chance of rain 40 percent.
Friday...Sunny in the morning, then partly sunny with a chance of showers with a slight chance of thunderstorms in the afternoon. Humid with highs in the upper 80s. Southwest winds 5 to 10 mph. Chance of rain 50 percent. Heat index values up to 104.
Friday Night...Mostly cloudy. A chance of showers in the evening. Lows in the lower 70s. Chance of rain 50 percent.
Saturday...Mostly sunny. Highs in the upper 80s. Heat index values in the upper 90s.
Saturday Night...Mostly cloudy in the evening, then becoming partly cloudy. Lows in the lower 70s.
Sunday...Sunny. Highs in the upper 80s. Heat index values in the upper 90s.
Sunday Night...Mostly clear in the evening, then becoming partly cloudy. Lows in the lower 70s.
Monday...Mostly sunny. Highs in the upper 80s. Heat index values in the mid 90s.
Monday Night...Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers. Lows in the lower 70s. Chance of rain 30 percent.
Tuesday...Partly sunny. A chance of showers in the afternoon. Highs in the upper 80s. Chance of rain 40 percent.
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