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%

Weather Radar for Port Jefferson, NY See Radar

* Playback displays weather for the past 6 hours.

NOAA Weather Marine Forecast for Port Jefferson, NY

Tonight
Low : 70ºF
SSW wind around 12 kt, with gusts as high as 23 kt. Mostly clear. Seas 1 ft or less.
Tuesday
High : 89ºF
WSW wind 10 to 12 kt. Sunny. Seas 1 ft or less.
Tuesday Night
Low : 76ºF
WSW wind 13 to 15 kt. Mostly clear. Seas 1 ft or less.
Wednesday
High : 92ºF
W wind 10 to 12 kt. A slight chance of showers and thunderstorms after 2pm. Seas 1 ft or less.
Wednesday Night
Low : 73ºF
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.
Thursday
High : 88ºF
Variable winds less than 5 kt becoming W 5 to 8 kt in the morning. Mostly sunny. Seas 1 ft or less.
Thursday Night
Low : 72ºF
WNW wind 5 to 10 kt. Partly cloudy. Seas 1 ft or less.
Friday
High : 86ºF
WNW wind around 6 kt. Sunny. Seas 1 ft or less.
Friday Night
Low : 70ºF
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

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    Wind Speed Forecast for Port Jefferson, NY

    TuesdayWednesday
    Wind Speed (MPH) 12119121415131110131413
    2am6am10am2pm6pm10pm2am6am10am2pm6pm10pm
    MPH 12119121415131110131413
    DIR SSWSWWSWWSWSWSWWSWWSWWSWWWWNW

    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).

    Weather Alerts
    Heat Advisory - 2:20pm Mon Jul 13 2026

    ...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 - 3:14pm Mon Jul 13 2026

    ...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.