National Weather Service forecast
Port Jefferson, New York Weather
Port Jefferson 7-Day Forecast
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Overnight53°FPatchy Fog3% chance of precipitation
Patchy fog. Partly cloudy, with a low around 53. Southwest wind around 5 mph.
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Wednesday70°FPatchy Fog then Sunny3% chance of precipitation
Patchy fog before 8am. Sunny. High near 70, with temperatures falling to around 65 in the afternoon. Southwest wind 5 to 10 mph.
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Wednesday Night58°FPartly Cloudy2% chance of precipitation
Partly cloudy, with a low around 58. South wind around 8 mph.
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Thursday69°FSlight Chance Rain Showers19% chance of precipitation
A slight chance of rain showers after 7am. Mostly cloudy. High near 69, with temperatures falling to around 65 in the afternoon. South wind 6 to 12 mph. Chance of precipitation is 20%.
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Thursday Night60°FRain Showers84% chance of precipitation
Rain showers. Mostly cloudy, with a low around 60. Southwest wind 6 to 9 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
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Friday66°FShowers And Thunderstorms91% chance of precipitation
Rain showers before 10am, then showers and thunderstorms. Cloudy. High near 66, with temperatures falling to around 63 in the afternoon. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
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Friday Night55°FShowers And Thunderstorms91% chance of precipitation
Showers and thunderstorms. Cloudy, with a low around 55. Chance of precipitation is 90%.
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Saturday64°FRain Showers Likely60% chance of precipitation
Rain showers likely. Partly sunny, with a high near 64. Chance of precipitation is 60%.
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Saturday Night46°FSlight Chance Rain Showers22% chance of precipitation
A slight chance of rain showers. Partly cloudy, with a low around 46.
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Sunday58°FSlight Chance Rain Showers then Mostly Sunny18% chance of precipitation
A slight chance of rain showers before 7am. Mostly sunny, with a high near 58.
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Sunday Night43°FPartly Cloudy14% chance of precipitation
Partly cloudy, with a low around 43.
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Monday58°FChance Light Rain26% chance of precipitation
A chance of rain after 7am. Mostly sunny, with a high near 58. Chance of precipitation is 30%.
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Monday Night43°FChance Light Rain26% chance of precipitation
A chance of rain. Partly cloudy, with a low around 43. Chance of precipitation is 30%.
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Tuesday58°FSlight Chance Light Rain then Mostly Sunny19% chance of precipitation
A slight chance of rain before 7am. Mostly sunny, with a high near 58.
Issued by the National Weather Service (OKX office), updated .
Port Jefferson Hourly Forecast
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Port Jefferson Weather Radar
Open the full radar for Port JeffersonAbout Port Jefferson
- Population (2020 Census)
- 7,962
- Coordinates
- 40.942, -73.053
- Elevation
- 161 ft
- NWS forecast office
- OKX
- Time zone
- America/New York
- Sunrise today
- 6:26 AM EST
- Sunset today
- 4:45 PM EST
- Daylight today
- 10 h 19 min
Port Jefferson Weather Questions
What is the weather forecast for Port Jefferson, New York?
Overnight: Patchy fog. Partly cloudy, with a low around 53. Southwest wind around 5 mph. Wednesday: Patchy fog before 8am. Sunny. High near 70, with temperatures falling to around 65 in the afternoon. Southwest wind 5 to 10 mph.
Will it rain or snow in Port Jefferson this week?
The best chance of precipitation is Friday at 91%. Periods with a 30% chance or more: Thursday Night (84%), Friday (91%), Friday Night (91%), Saturday (60%).
How warm and how cold will it get in Port Jefferson this week?
The warmest day is Wednesday, with a high near 70°F. The coldest night is Sunday Night, with a low near 43°F.
What time are sunrise and sunset in Port Jefferson today?
Sunrise is at 6:26 AM EST and sunset is at 4:45 PM EST, for 10 h 19 min of daylight.
Weather near Port Jefferson
- Port Jefferson Station 1 mi
- Belle Terre 1 mi
- Mount Sinai 2 mi
- Poquott 2 mi
- Terryville 2 mi
- East Setauket 3 mi
- Miller Place 3 mi
- Setauket 3 mi