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.
This Afternoon
68°F
Mostly Sunny
Mostly sunny. High near 68, with temperatures falling to around 66 in the afternoon. East wind around 8 mph.
7-day forecast for Port Jefferson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Mostly Sunny | 8 mph E | 0% |
| Tonight | 57°F | Mostly Cloudy | 7 mph SE | 2% |
| Sunday | 71°F | Rain Showers then Rain | 6 to 12 mph SE | 84% |
| Sunday Night | 57°F | Rain then Rain Showers | 7 to 14 mph W | 84% |
| Monday | 68°F | Chance Rain Showers | 9 to 15 mph NE | 36% |
| Monday Night | 55°F | Chance Rain Showers | 9 to 14 mph NE | 26% |
| Tuesday | 65°F | Chance Rain Showers | 15 mph NE | 26% |
| Tuesday Night | 54°F | Slight Chance Rain Showers then Mostly Cloudy | 14 to 17 mph NE | 23% |
| Wednesday | 66°F | Mostly Cloudy | 17 to 21 mph NE | 12% |
| Wednesday Night | 54°F | Slight Chance Rain Showers | 20 mph NE | 23% |
| Thursday | 65°F | Chance Rain Showers | 21 mph NE | 33% |
| Thursday Night | 53°F | Chance Rain Showers | 21 mph NE | 39% |
| Friday | 65°F | Chance Rain Showers | 23 mph N | 43% |
| Friday Night | 54°F | Chance Rain Showers | 20 to 23 mph N | 43% |
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
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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 Sep 19, 2026.