Marine Weather Net

Port Jefferson, NY Weather Forecast




Port Jefferson, New York

 Lat: 40.95N, Lon: 73.06W

Current Conditions Updated: 1256 AM EDT SAT JUL 19 2025

Clear


Temp: 69°F
  • Humidity:
  • 73%
  • Winds:
  • 3 MPH N
  • Gusts:
  • N/A MPH
  • Barometer:
  • 30.11 in.
  • Dewpoint:
  • 60°F
  • Heat index:
  • 69°F

  • Sunrise:
  • 5:34 AM EDT
  • Sunset:
  • 8:19 PM EDT
  • Moonrise:
  • 12:26 AM EDT
  • Moonset:
  • 3:34 PM EDT

THIS AFTERNOON

MOSTLY SUNNY
Hi: 81°F
Lo: 65°F

SATURDAY

SUNNY

Hi: 85°F
Lo: 75°F

SUNDAY

PARTLY SUNNY
Hi: 89°F
Lo: 67°F
Precip: 50%

MONDAY

SUNNY

Hi: 85°F
Lo: 65°F
Weather Forecast In Detail:
Forecast Issued: 142 PM EDT Fri Jul 18 2025

This Afternoon...Mostly sunny. Highs in the lower 80s. Northwest winds 5 to 10 mph.
Tonight...Partly cloudy in the evening, then clearing. Lows in the mid 60s. North winds around 5 mph.
Saturday...Sunny. Highs in the mid 80s. East winds around 5 mph, becoming south in the afternoon.
Saturday Night...Mostly cloudy with a chance of showers and thunderstorms. Humid with lows in the lower 70s. South winds 5 to 10 mph. Chance of rain 50 percent.
Sunday...Partly sunny with a chance of showers and thunderstorms. Humid with highs in the upper 80s. Southwest winds 5 to 10 mph. Chance of rain 50 percent. Heat index values in the upper 90s.
Sunday Night...Partly cloudy with a chance of showers and thunderstorms in the evening, then mostly clear after midnight. Lows in the upper 60s. Chance of rain 50 percent.
Monday...Sunny. Highs in the mid 80s.
Monday Night...Mostly clear. Lows in the mid 60s.
Tuesday...Sunny. Highs in the lower 80s.
Tuesday Night...Mostly clear. Lows in the upper 60s.
Wednesday...Sunny. Highs in the mid 80s.
Wednesday Night...Partly cloudy. Lows in the lower 70s.
Thursday...Mostly sunny. Highs in the upper 80s. Heat index values in the upper 90s.
Thursday Night...Mostly cloudy with a chance of showers. Lows in the mid 70s. Chance of rain 30 percent.
Friday...Partly sunny. A chance of showers in the afternoon. Highs around 90. Chance of rain 30 percent. Heat index values up to 100.
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