Northwest Harbor, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Northwest Harbor, a community in Suffolk County, New York.
This Afternoon
67°F
Mostly Sunny
Mostly sunny, with a high near 67. East wind around 6 mph.
7-day forecast for Northwest Harbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Mostly Sunny | 6 mph E | 0% |
| Tonight | 56°F | Mostly Cloudy | 5 mph SE | 0% |
| Sunday | 71°F | Rain Showers Likely then Rain | 5 to 9 mph SE | 82% |
| Sunday Night | 58°F | Rain then Rain Showers | 5 to 10 mph S | 92% |
| Monday | 68°F | Chance Rain Showers | 8 to 13 mph NE | 54% |
| Monday Night | 56°F | Mostly Cloudy | 7 to 10 mph NE | 14% |
| Tuesday | 66°F | Slight Chance Rain Showers | 14 mph NE | 24% |
| Tuesday Night | 56°F | Slight Chance Rain Showers then Mostly Cloudy | 12 to 15 mph NE | 24% |
| Wednesday | 67°F | Slight Chance Rain Showers | 16 to 20 mph NE | 15% |
| Wednesday Night | 56°F | Slight Chance Rain Showers | 15 to 20 mph NE | 23% |
| Thursday | 66°F | Chance Rain Showers | 17 to 21 mph NE | 34% |
| Thursday Night | 55°F | Chance Rain Showers | 17 to 21 mph NE | 43% |
| Friday | 67°F | Chance Rain Showers | 18 to 22 mph NE | 44% |
| Friday Night | 56°F | Chance Rain Showers | 20 mph N | 44% |
Forecast source: National Weather Service (api.weather.gov) for Northwest Harbor (41.014, -72.220). Updated through the day.
Growing snapshot for Northwest Harbor
Last spring frost
Apr 23
First fall frost
Oct 24
Growing season
182 days
Hardiness zone
7b
More local growing data for Northwest Harbor: nearby ZIP 11937 weather · frost dates · planting calendar · New York frost dates
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Climate data from the nearest NOAA station, Bridgehampton, Ny (5.9 mi from Northwest Harbor). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.