Stony Brook, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Stony Brook, a community in Suffolk County, New York.
Today
83°F
Mostly Sunny
Mostly sunny, with a high near 83. Northeast wind 2 to 6 mph.
7-day forecast for Stony Brook
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Mostly Sunny | 2 to 6 mph NE | 0% |
| Tonight | 66°F | Mostly Cloudy | 5 mph E | 6% |
| Wednesday | 83°F | Partly Sunny | 2 to 6 mph SE | 10% |
| Wednesday Night | 72°F | Mostly Cloudy then Slight Chance Rain Showers | 7 mph S | 19% |
| Thursday | 88°F | Mostly Sunny | 5 to 12 mph SW | 11% |
| Thursday Night | 74°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 6 to 12 mph SW | 19% |
| Friday | 89°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 6 to 9 mph SW | 21% |
| Friday Night | 73°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 9 mph SW | 31% |
| Saturday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 8 mph SW | 24% |
| Saturday Night | 72°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 8 mph SW | 25% |
| Sunday | 88°F | Mostly Sunny | 5 to 8 mph SW | 13% |
| Sunday Night | 73°F | Mostly Clear | 7 mph SW | 10% |
| Monday | 89°F | Sunny | 5 to 9 mph W | 8% |
| Monday Night | 72°F | Slight Chance Rain Showers | 6 to 9 mph W | 18% |
Forecast source: National Weather Service (api.weather.gov) for Stony Brook (40.908, -73.127). Updated through the day.
Growing snapshot for Stony Brook
Last spring frost
Apr 15
First fall frost
Nov 10
Growing season
208 days
Hardiness zone
7b
More local growing data for Stony Brook: nearby ZIP 11790 weather · frost dates · planting calendar · New York frost dates
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Climate data from the nearest NOAA station, Setauket Strong, Ny (3.7 mi from Stony Brook). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.