Syosset, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Syosset, a community in Nassau County, New York.
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. East wind around 6 mph.
7-day forecast for Syosset
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 6 mph E | 0% |
| Tonight | 66°F | Mostly Cloudy | 2 to 6 mph E | 4% |
| Wednesday | 84°F | Partly Sunny then Slight Chance Rain Showers | 2 to 9 mph E | 19% |
| Wednesday Night | 72°F | Slight Chance Rain Showers | 5 to 8 mph S | 22% |
| Thursday | 88°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 12 mph SW | 25% |
| Thursday Night | 74°F | Chance Showers And Thunderstorms then Partly Cloudy | 6 to 12 mph SW | 29% |
| Friday | 90°F | Mostly Sunny then Chance Showers And Thunderstorms | 6 to 10 mph SW | 31% |
| Friday Night | 73°F | Chance Showers And Thunderstorms | 5 to 8 mph SW | 36% |
| Saturday | 88°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 9 mph SW | 29% |
| Saturday Night | 72°F | Chance Showers And Thunderstorms | 8 mph SW | 31% |
| Sunday | 89°F | Mostly Sunny | 6 to 9 mph SW | 13% |
| Sunday Night | 73°F | Mostly Clear | 8 mph SW | 13% |
| Monday | 91°F | Sunny | 6 to 12 mph W | 11% |
| Monday Night | 72°F | Slight Chance Rain Showers | 7 to 12 mph W | 18% |
Forecast source: National Weather Service (api.weather.gov) for Syosset (40.816, -73.502). Updated through the day.
Growing snapshot for Syosset
Last spring frost
Apr 9
First fall frost
Nov 10
Growing season
215 days
Hardiness zone
7b
More local growing data for Syosset: nearby ZIP 11791 weather · frost dates · planting calendar · New York frost dates
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Climate data from the nearest NOAA station, Centerport, Ny (7.8 mi from Syosset). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.