Sag Harbor, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sag Harbor, a village in Suffolk County, New York.
Today
79°F
Mostly Sunny
Mostly sunny. High near 79, with temperatures falling to around 77 in the afternoon. East wind around 5 mph.
7-day forecast for Sag Harbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Mostly Sunny | 5 mph E | 0% |
| Tonight | 66°F | Mostly Cloudy then Slight Chance Rain Showers | 3 mph NE | 17% |
| Wednesday | 80°F | Mostly Sunny | 2 to 6 mph SW | 14% |
| Wednesday Night | 71°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph S | 16% |
| Thursday | 83°F | Mostly Sunny | 5 to 10 mph SW | 9% |
| Thursday Night | 73°F | Mostly Clear | 5 to 9 mph SW | 12% |
| Friday | 84°F | Sunny | 5 to 9 mph SW | 8% |
| 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 | 12% |
| Saturday Night | 72°F | Slight Chance Showers And Thunderstorms | 3 to 7 mph SW | 21% |
| Sunday | 84°F | Mostly Sunny | 3 to 8 mph SW | 12% |
| Sunday Night | 72°F | Mostly Clear | 5 to 8 mph SW | 7% |
| Monday | 86°F | Sunny | 5 to 9 mph SW | 7% |
| Monday Night | 71°F | Mostly Clear | 5 to 8 mph W | 13% |
Forecast source: National Weather Service (api.weather.gov) for Sag Harbor (40.994, -72.289). Updated through the day.
Growing snapshot for Sag Harbor
Last spring frost
Apr 23
First fall frost
Oct 24
Growing season
182 days
Hardiness zone
7a
More local growing data for Sag Harbor: nearby ZIP 11963 weather · frost dates · planting calendar · New York frost dates
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Climate data from the nearest NOAA station, Bridgehampton, Ny (3.6 mi from Sag Harbor). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.