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.
Today
80°F
Mostly Sunny
Mostly sunny. High near 80, with temperatures falling to around 77 in the afternoon. East wind around 5 mph.
7-day forecast for Northwest Harbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 80°F | Mostly Sunny | 5 mph E | 0% |
| Tonight | 66°F | Mostly Cloudy then Slight Chance Rain Showers | 3 mph E | 18% |
| Wednesday | 81°F | Slight Chance Rain Showers then Mostly Sunny | 2 to 6 mph W | 15% |
| Wednesday Night | 71°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph S | 16% |
| Thursday | 85°F | Mostly Sunny | 5 to 10 mph SW | 9% |
| Thursday Night | 73°F | Mostly Clear | 5 to 8 mph SW | 11% |
| Friday | 86°F | Sunny | 5 to 9 mph SW | 7% |
| Friday Night | 72°F | Slight Chance Showers And Thunderstorms | 3 to 8 mph SW | 18% |
| Saturday | 85°F | Mostly Sunny | 3 to 8 mph SW | 11% |
| Saturday Night | 72°F | Slight Chance Showers And Thunderstorms | 3 to 7 mph SW | 20% |
| Sunday | 84°F | Mostly Sunny | 3 to 8 mph SW | 12% |
| Sunday Night | 72°F | Mostly Clear | 3 to 8 mph SW | 7% |
| Monday | 86°F | Sunny | 3 to 9 mph SW | 6% |
| Monday Night | 71°F | Mostly Clear | 5 to 8 mph W | 12% |
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 Aug 4, 2026.