Port Jefferson, NY Weather Forecast
Local 7-day forecast
Light Rain Likely
Track current conditions, temperature changes, wind, and the full daily outlook for Port Jefferson, NY in one place.
A slight chance of rain between 7am and 10am, then rain likely and a slight chance of thunderstorms. Mostly cloudy. High near 61, with temperatures falling to around 55 in the afternoon. East wind 7 to 12 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
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: Nov 11, 2026 2:27 PM EST.
The active forecast window currently covers Nov 12 to Nov 17, 2026 for Port Jefferson, NY.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Nov 12 to Nov 17, 2026
- Latest sync
- Nov 11, 2026 2:27 PM EST
- Forecast office
- OKX
- Source
- NOAA / NWS
Daily Outlook
This Week in Port Jefferson
Thursday looks like the warmest upcoming period in Port Jefferson at 61 degrees F.
Monday Night is the coolest period ahead with temperatures near 33 degrees F.
The strongest winds are forecast for Friday at about 14 mph N.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- Nov 11, 2026 2:27 PM EST
- 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
Rain. Mostly cloudy. Low around 41, with temperatures rising to around 45 overnight. Northeast wind 8 to 13 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Rain. Mostly cloudy. High near 50, with temperatures falling to around 45 in the afternoon. North wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Rain likely. Mostly cloudy, with a low around 35. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
A chance of rain before 7am. Partly sunny, with a high near 48. Chance of precipitation is 30%.
Mostly cloudy, with a low around 35.
Mostly sunny, with a high near 51.
Partly cloudy, with a low around 34.
Sunny, with a high near 51.
Mostly clear, with a low around 33.
Sunny, with a high near 52.
Partly cloudy, with a low around 34.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Nov 12
|
Light Rain Likely
|
61°F |
7 to 12 mph
E
|
|
Thursday Night
Nov 12
|
Light Rain
|
41°F |
8 to 13 mph
NE
|
|
Friday
Nov 13
|
Light Rain
|
50°F |
14 mph
N
|
|
Friday Night
Nov 13
|
Light Rain Likely
|
35°F |
8 to 12 mph
NW
|
|
Saturday
Nov 14
|
Chance Light Rain then Partly Sunny
|
48°F |
14 mph
NW
|
|
Saturday Night
Nov 14
|
Mostly Cloudy
|
35°F |
8 to 12 mph
NW
|
|
Sunday
Nov 15
|
Mostly Sunny
|
51°F |
9 to 13 mph
NW
|
|
Sunday Night
Nov 15
|
Partly Cloudy
|
34°F |
6 to 9 mph
NW
|
|
Monday
Nov 16
|
Sunny
|
51°F |
7 to 10 mph
NW
|
|
Monday Night
Nov 16
|
Mostly Clear
|
33°F |
6 mph
N
|
|
Tuesday
Nov 17
|
Sunny
|
52°F |
7 mph
NW
|
|
Tuesday Night
Nov 17
|
Partly Cloudy
|
34°F |
5 mph
NW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Port Jefferson.
