Port Jefferson, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Port Jefferson, a village in Suffolk County, New York.
Overnight
66°F
Partly Cloudy
Partly cloudy, with a low around 66. North wind around 3 mph.
7-day forecast for Port Jefferson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 66°F | Partly Cloudy | 3 mph N | 0% |
| Tuesday | 82°F | Mostly Sunny | 2 to 6 mph NE | 0% |
| Tuesday Night | 66°F | Mostly Cloudy | 5 mph E | 6% |
| Wednesday | 82°F | Partly Sunny | 2 to 6 mph SE | 9% |
| Wednesday Night | 71°F | Mostly Cloudy then Slight Chance Rain Showers | 6 mph S | 18% |
| Thursday | 87°F | Mostly Sunny | 5 to 12 mph SW | 11% |
| Thursday Night | 73°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 6 to 12 mph SW | 19% |
| Friday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 6 to 9 mph SW | 20% |
| Friday Night | 73°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 9 mph SW | 30% |
| Saturday | 87°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 8 mph SW | 23% |
| Saturday Night | 72°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 8 mph SW | 25% |
| Sunday | 87°F | Mostly Sunny | 5 to 8 mph SW | 13% |
| Sunday Night | 73°F | Mostly Clear | 5 to 8 mph SW | 10% |
| Monday | 88°F | Sunny | 5 to 9 mph W | 8% |
Forecast source: National Weather Service (api.weather.gov) for Port Jefferson (40.942, -73.053). Updated through the day.
Growing snapshot for Port Jefferson
Last spring frost
Apr 15
First fall frost
Nov 10
Growing season
208 days
Hardiness zone
7b
More local growing data for Port Jefferson: nearby ZIP 11777 weather · frost dates · planting calendar · New York frost dates
Nearby towns & communities
Amagansett
Amityville
Aquebogue
Asharoken
Babylon
Baiting Hollow
Bay Shore
Bayport
Baywood
Belle Terre
Bellport
Blue Point
Bohemia
Brentwood
Bridgehampton
Brightwaters
Brookhaven
Calverton
Captree
Center Moriches
Centereach
Centerport
Central Islip
Cold Spring Harbor
Commack
Copiague
Coram
Cutchogue
Deer Park
Dering Harbor
Climate data from the nearest NOAA station, Setauket Strong, Ny (2 mi from Port Jefferson). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.