Port Jefferson, NY Weather Forecast
Local 7-day forecast
Partly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Port Jefferson, NY in one place.
Partly sunny. High near 67, with temperatures falling to around 65 in the afternoon. Northeast wind around 17 mph, with gusts as high as 31 mph.
Local Weather Overview
This forecast page for Port Jefferson, NY is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Sep 22, 2026 1:44 PM EDT.
The active forecast window currently covers Sep 23 to Sep 28, 2026 for Port Jefferson, NY.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 23 to Sep 28, 2026
- Latest sync
- Sep 22, 2026 1:44 PM EDT
- Forecast office
- OKX
- Source
- NOAA / NWS
Daily Outlook
This Week in Port Jefferson
Monday looks like the warmest upcoming period in Port Jefferson at 69 degrees F.
Thursday Night is the coolest period ahead with temperatures near 52 degrees F.
The strongest winds are forecast for Saturday at about 23 mph N.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 22, 2026 1:44 PM EDT
- Coverage
- 6 days
- Time zone
- America/New_York
- Forecast office
- OKX
- Radar station
- KOKX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 53. Northeast wind around 15 mph, with gusts as high as 26 mph.
Partly sunny. High near 66, with temperatures falling to around 64 in the afternoon. Northeast wind 15 to 18 mph, with gusts as high as 31 mph.
A chance of rain showers after 2am. Mostly cloudy. Low around 52, with temperatures rising to around 54 overnight. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch possible.
A chance of rain showers. Mostly cloudy, with a high near 66. Chance of precipitation is 40%.
Rain showers likely. Mostly cloudy, with a low around 54. Chance of precipitation is 60%.
Rain showers likely. Mostly cloudy, with a high near 66. Chance of precipitation is 60%.
Rain showers likely. Mostly cloudy, with a low around 54. Chance of precipitation is 60%.
A chance of rain showers. Partly sunny, with a high near 68. Chance of precipitation is 50%.
A chance of rain showers. Mostly cloudy, with a low around 55. Chance of precipitation is 30%.
A slight chance of rain showers before 8am. Mostly sunny, with a high near 69.
Partly cloudy, with a low around 55.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Sep 23
|
Partly Sunny
|
67°F |
17 mph
NE
|
|
Wednesday Night
Sep 23
|
Partly Cloudy
|
53°F |
15 mph
NE
|
|
Thursday
Sep 24
|
Partly Sunny
|
66°F |
15 to 18 mph
NE
|
|
Thursday Night
Sep 24
|
Mostly Cloudy then Chance Rain Showers
|
52°F |
14 to 17 mph
NE
|
|
Friday
Sep 25
|
Chance Rain Showers
|
66°F |
21 mph
N
|
|
Friday Night
Sep 25
|
Rain Showers Likely
|
54°F |
21 mph
N
|
|
Saturday
Sep 26
|
Rain Showers Likely
|
66°F |
23 mph
N
|
|
Saturday Night
Sep 26
|
Rain Showers Likely
|
54°F |
17 to 21 mph
N
|
|
Sunday
Sep 27
|
Chance Rain Showers
|
68°F |
18 mph
N
|
|
Sunday Night
Sep 27
|
Chance Rain Showers
|
55°F |
10 to 15 mph
N
|
|
Monday
Sep 28
|
Slight Chance Rain Showers then Mostly Sunny
|
69°F |
14 mph
N
|
|
Monday Night
Sep 28
|
Partly Cloudy
|
55°F |
6 to 10 mph
NE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Port Jefferson.
