Port Jefferson, NY Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Port Jefferson, NY in one place.
Mostly sunny, with a high near 67. Northwest wind 2 to 8 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: Apr 21, 2026 2:17 PM EDT.
The active forecast window currently covers Apr 23 to Apr 27, 2026 for Port Jefferson, NY.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 23 to Apr 27, 2026
- Latest sync
- Apr 21, 2026 2:17 PM EDT
- Forecast office
- OKX
- Source
- NOAA / NWS
Daily Outlook
This Week in Port Jefferson
Thursday looks like the warmest upcoming period in Port Jefferson at 67 degrees F.
Saturday Night is the coolest period ahead with temperatures near 42 degrees F.
The strongest winds are forecast for Sunday at about 7 to 12 mph E.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 21, 2026 2:17 PM EDT
- Coverage
- 5 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
Mostly cloudy, with a low around 45.
Mostly sunny, with a high near 60.
A chance of rain showers after 2am. Partly cloudy, with a low around 43. Chance of precipitation is 30%.
A chance of rain showers. Mostly cloudy, with a high near 54. Chance of precipitation is 50%.
A chance of rain showers. Mostly cloudy, with a low around 42. Chance of precipitation is 50%.
A chance of rain showers. Mostly cloudy, with a high near 56. Chance of precipitation is 40%.
A chance of rain showers. Mostly cloudy, with a low around 43. Chance of precipitation is 30%.
A slight chance of rain showers. Mostly sunny, with a high near 59.
A slight chance of rain showers. Partly cloudy, with a low around 43.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Apr 23
|
Mostly Sunny
|
67°F |
2 to 8 mph
NW
|
|
Thursday Night
Apr 23
|
Mostly Cloudy
|
45°F |
2 to 6 mph
NW
|
|
Friday
Apr 24
|
Mostly Sunny
|
60°F |
3 to 7 mph
E
|
|
Friday Night
Apr 24
|
Partly Cloudy then Chance Rain Showers
|
43°F |
6 mph
SE
|
|
Saturday
Apr 25
|
Chance Rain Showers
|
54°F |
5 to 10 mph
E
|
|
Saturday Night
Apr 25
|
Chance Rain Showers
|
42°F |
8 mph
E
|
|
Sunday
Apr 26
|
Chance Rain Showers
|
56°F |
7 to 12 mph
E
|
|
Sunday Night
Apr 26
|
Chance Rain Showers
|
43°F |
5 to 9 mph
E
|
|
Monday
Apr 27
|
Slight Chance Rain Showers
|
59°F |
6 to 9 mph
E
|
|
Monday Night
Apr 27
|
Slight Chance Rain Showers
|
43°F |
7 mph
E
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Port Jefferson.
