Port Jefferson, NY Weather Forecast
Suffolk County, New York
Live radar, warnings and storm tracking for Port Jefferson, with free alerts the moment it counts.
The next few hours
Taller, warmer bars mean heavier rain. Dotted means no reading for that hour.
Hour by hour
Sunrise and sunset
Next five days, scored 0 to 100The first day or two use the HRRR and NBM cloud layers. Later days only have total cloud, so treat them as a rough guide.
Know when sunset at this place will be worth a photo
We score every sunrise and sunset here from the cloud, haze and smoke forecast, and let you know when one is likely to light up. Sunrise the evening before, sunset a few hours ahead.
Seven-day outlook
Free alerts for Port Jefferson
Every NWS warning, pushed to your phone, inbox or webhook the moment it is issued.
Port Jefferson, NY at a glance
Port Jefferson is home to about 8,129 people in Suffolk County, across 3.1 square miles. It ranks 235th by population of 593 places in New York with a forecast here. The nearest neighbour with its own forecast is Smithtown, 7 miles away.
- County
- Suffolk County
- Population
- 8,129 2023 est.
- Land area
- 3.1 sq mi
- People per sq mi
- 2,654
- Forecast point
- 40.9422°N, 73.0528°W
How well can the network see Port Jefferson?
The nearest Doppler radar is KOKX (New York City, NY), to the ESE. Its lowest scan passes about 580 ft above Port Jefferson. That is about as close as US radar coverage gets: low-level rotation and gust fronts over Port Jefferson show up clearly. Port Jefferson is closer to its radar than 94% of US cities.
The closest weather station is KISP (Islip/Macarthur Arpt). Representative on most days, though a thunderstorm can hit one and miss the other.
Forecasts near Port Jefferson
- Smithtown, NY7 mi
- Lake Grove, NY7 mi
- Brookhaven, NY8 mi
- Islandia, NY11 mi
- Patchogue, NY12 mi
- Northport, NY15 mi
- Islip, NY17 mi
- Huntington, NY17 mi
Elsewhere in New York
New YorkBrookhavenIslipOyster BayBuffaloNorth HempsteadAll New York forecasts →