Port Jefferson, NY Weather Forecast and Current Conditions
| Day | Sky | High / Low | Precip | Wind | Humidity | |
|---|---|---|---|---|---|---|
|
Mon Jul 13 |
Mostly Clear Close Hourly |
-º / 70º | 2% | SW 12 mph | 69% | |
| 10pm | Clear | 73º | 1% | SSW 12 mph | 68% | |
| 11pm | Clear | 73º | 1% | SSW 11 mph | 68% | |
|
Tue Jul 14 |
Mostly Sunny View Hourly |
92º / 78º | 1% | WSW 16 mph | 54% | |
| 12am | Clear | 72º | 1% | SW 12 mph | 70% | |
| 1am | Clear | 73º | 1% | SW 11 mph | 69% | |
| 2am | Clear | 72º | 1% | SW 11 mph | 69% | |
| 3am | Clear | 72º | 1% | SW 10 mph | 70% | |
| 4am | Clear | 71º | 1% | SW 10 mph | 70% | |
| 5am | Partly Cloudy | 71º | 1% | WSW 10 mph | 69% | |
| 6am | Partly Cloudy | 71º | 2% | WSW 9 mph | 71% | |
| 7am | Partly Cloudy | 72º | 2% | WSW 10 mph | 71% | |
| 8am | Partly Cloudy | 75º | 1% | WSW 11 mph | 66% | |
| 9am | Mostly Sunny | 78º | 1% | WSW 12 mph | 60% | |
| 10am | Sunny | 81º | 0% | WSW 12 mph | 57% | |
| 11am | Sunny | 84º | 0% | WSW 12 mph | 53% | |
| 12pm | Sunny | 86º | 0% | WSW 12 mph | 51% | |
| 1pm | Sunny | 88º | 0% | WSW 13 mph | 48% | |
| 2pm | Sunny | 90º | 0% | SW 14 mph | 47% | |
| 3pm | Sunny | 90º | 0% | SW 15 mph | 47% | |
| 4pm | Mostly Sunny | 90º | 0% | SW 16 mph | 47% | |
| 5pm | Mostly Sunny | 90º | 0% | SW 15 mph | 48% | |
| 6pm | Mostly Sunny | 89º | 0% | SW 15 mph | 49% | |
| 7pm | Mostly Sunny | 87º | 1% | SW 14 mph | 52% | |
| 8pm | Mostly Sunny | 86º | 1% | SW 13 mph | 55% | |
| 9pm | Clear | 85º | 1% | WSW 13 mph | 57% | |
| 10pm | Mostly Clear | 85º | 1% | WSW 13 mph | 57% | |
| 11pm | Mostly Clear | 84º | 1% | WSW 13 mph | 59% | |
|
Wed Jul 15 |
Mostly Sunny View Hourly |
93º / 74º | 2% | W 14 mph | 52% | |
| 12am | Clear | 83º | 1% | WSW 13 mph | 61% | |
| 1am | Clear | 83º | 1% | WSW 12 mph | 63% | |
| 2am | Clear | 82º | 1% | WSW 11 mph | 64% | |
| 3am | Clear | 81º | 2% | W 11 mph | 66% | |
| 4am | Clear | 80º | 2% | W 10 mph | 66% | |
| 5am | Clear | 80º | 2% | W 10 mph | 67% | |
| 6am | Sunny | 79º | 2% | WSW 10 mph | 69% | |
| 7am | Sunny | 80º | 2% | WSW 10 mph | 68% | |
| 8am | Sunny | 83º | 1% | W 11 mph | 63% | |
| 9am | Sunny | 85º | 1% | W 12 mph | 60% | |
| 10am | Sunny | 86º | 0% | W 13 mph | 56% | |
| 11am | Sunny | 88º | 0% | W 14 mph | 55% | |
| 12pm | Sunny | 90º | 0% | WNW 14 mph | 52% | |
| 1pm | Sunny | 91º | 0% | WNW 13 mph | 49% | |
| 2pm | Partly Cloudy | 92º | 0% | W 14 mph | 47% | |
| 3pm | Partly Cloudy | 92º | 0% | WNW 14 mph | 44% | |
| 4pm | Partly Cloudy | 92º | 0% | WNW 14 mph | 44% | |
| 5pm | Sunny | 92º | 1% | WNW 14 mph | 42% | |
| 6pm | Partly Cloudy | 90º | 2% | WNW 13 mph | 43% | |
| 7pm | Partly Cloudy | 89º | 1% | NW 12 mph | 44% | |
| 8pm | Partly Cloudy | 87º | 4% | NW 10 mph | 46% | |
| 9pm | Partly Cloudy | 85º | 7% | NW 9 mph | 48% | |
|
Thu Jul 16 |
Partly Cloudy | 89º / 72º | 5% | W 12 mph | 46% | |
|
Fri Jul 17 |
Partly Cloudy | 87º / 69º | 0% | WNW 9 mph | 45% | |
|
Sat Jul 18 |
Showers | 79º / 69º | 39% | SE 9 mph | 66% | |
|
Sun Jul 19 |
Scattered Thunderstorms | 83º / 69º | 60% | WSW 10 mph | 69% | |
|
Mon Jul 20 |
Partly Cloudy | 81º / 70º | 23% | SE 11 mph | 70% | |
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Buoy Data
For Port Jefferson, NY -
Wind Forecast
In Port Jefferson, NY -
Radar
In Port Jefferson, NY -
Marine Forecast
In Port Jefferson, NY
Weather Radar for Port Jefferson, NY See Radar
* Playback displays weather for the past 6 hours.
NOAA Weather Marine Forecast for Port Jefferson, NY
SSW wind around 12 kt, with gusts as high as 23 kt. Mostly clear. Seas 1 ft or less.
WSW wind 10 to 12 kt. Sunny. Seas 1 ft or less.
WSW wind 13 to 15 kt. Mostly clear. Seas 1 ft or less.
W wind 10 to 12 kt. A slight chance of showers and thunderstorms after 2pm. Seas 1 ft or less.
NW wind 5 to 10 kt becoming variable and less than 5 kt after midnight. A slight chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 2am. Seas 1 ft or less.
Variable winds less than 5 kt becoming W 5 to 8 kt in the morning. Mostly sunny. Seas 1 ft or less.
WNW wind 5 to 10 kt. Partly cloudy. Seas 1 ft or less.
WNW wind around 6 kt. Sunny. Seas 1 ft or less.
W wind 5 to 7 kt becoming variable and less than 5 kt in the evening. Partly cloudy. Seas 1 ft or less.
NOAA Buoy Data Near Port Jefferson, NY See Map
Wind Speed Forecast for Port Jefferson, NY
| Tuesday | Wednesday | |||||||||||
| Wind Speed (MPH) | 12 | 11 | 9 | 12 | 14 | 15 | 13 | 11 | 10 | 13 | 14 | 13 |
| 2am | 6am | 10am | 2pm | 6pm | 10pm | 2am | 6am | 10am | 2pm | 6pm | 10pm | |
| MPH | 12 | 11 | 9 | 12 | 14 | 15 | 13 | 11 | 10 | 13 | 14 | 13 |
| DIR | SSW | SW | WSW | WSW | SW | SW | WSW | WSW | WSW | W | W | WNW |
Current Weather Conditions In Port Jefferson, NY
As Of: 39 minutes ago
- 73ºF
- 73ºF
- 12mph
- 0º (SSW)
- 21mph
- Clear
- 10mi
- 30.14"
- 68%
- 0ºF
The weather right now in Port Jefferson, NY is Clear. The current temperature is 73°F, and the expected high and low for today, Monday, July 13, 2026, are -° high temperature and 70°F low temperature. The wind is currently blowing at 12 miles per hour, and coming from the South Southwest. The wind is gusting to 21 mph. With the wind and the atmosphere the temperature feels like 73° Fahrenheit. Expected precipitation is 1 percent, with current humidity at 68 percent, and air pressure at 30.14 in. Visibility is 10 nautical miles. There are 2 current weather alert(s).
...HEAT ADVISORY NOW IN EFFECT FROM 11 AM TO 9 PM EDT WEDNESDAY...
WHAT: Heat index values up to 102 expected.
WHERE: Northwest Suffolk County.
WHEN: From 11 AM to 9 PM EDT Wednesday.
IMPACTS: Hot temperatures and high humidity may cause heat
illnesses.
PRECAUTIONARY / PREPAREDNESS ACTIONS:
A Heat Advisory is issued when the combination of heat and humidity
is expected to make it feel like it is 95 to 99 degrees for two or
more consecutive days, or 100 to 104 degrees for any length of time.
Seniors and those with chronic health problems or mental health
conditions are at an increased risk. Homes without air conditioning
can be much hotter than outdoor temperatures.
Use air conditioning to stay cool at home or go to a place that has
air conditioning. If you don't have home air conditioning, continue
to seek out cool spaces each day as long as it remains hot, and for
a few days after if your home is still hot. Check on vulnerable
friends, family members and neighbors.
To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! In cases of heat stroke call 9 1 1.
&&
...AIR QUALITY ALERT IN EFFECT FROM 11 AM TO 11 PM EDT TUESDAY...
The New York State Department of Environmental Conservation has
issued an Air Quality Health Advisory for the following counties:
New York, Bronx, Kings, Queens, Richmond, Nassau, Suffolk,
Westchester, Rockland
from 11 AM to 11 PM EDT Tuesday.
Air quality levels in outdoor air are predicted to be greater than
an Air Quality Index value of 100 for the pollutant of Ground Level
Ozone. The Air Quality Index, or AQI, was created as an easy way to
correlate levels of different pollutants to one scale. The higher
the AQI value, the greater the health concern.
When pollution levels are elevated, the New York State Department of
Health recommends that individuals consider limiting strenuous
outdoor physical activity to reduce the risk of adverse health
effects. People who may be especially sensitive to the effects of
elevated levels of pollutants include the very young, and those with
preexisting respiratory problems such as asthma or heart disease.
Those with symptoms should consider consulting their personal
physician.
For additional information, please visit the New York State
Department of Environmental Conservation website at,
https://on.ny.gov/nyaqi, or call the Air Quality Hotline at
1 800 5 3 5, 1 3 4 5.