Syosset, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Syosset, a community in Nassau County, New York.
Today
71°F
Partly Sunny
Partly sunny. High near 71, with temperatures falling to around 69 in the afternoon. East wind around 9 mph.
7-day forecast for Syosset
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Partly Sunny | 9 mph E | 0% |
| Tonight | 57°F | Mostly Cloudy | 7 mph SE | 2% |
| Sunday | 71°F | Rain | 7 to 10 mph SE | 85% |
| Sunday Night | 57°F | Rain | 7 to 12 mph E | 85% |
| Monday | 68°F | Chance Light Rain then Mostly Cloudy | 10 to 15 mph NE | 42% |
| Monday Night | 54°F | Mostly Cloudy then Slight Chance Rain Showers | 9 to 14 mph NE | 19% |
| Tuesday | 65°F | Chance Rain Showers | 16 mph NE | 25% |
| Tuesday Night | 53°F | Chance Rain Showers | 17 mph NE | 25% |
| Wednesday | 65°F | Slight Chance Rain Showers | 20 mph NE | 21% |
| Wednesday Night | 53°F | Chance Rain Showers | 21 mph NE | 33% |
| Thursday | 65°F | Chance Rain Showers | 22 mph NE | 33% |
| Thursday Night | 52°F | Chance Rain Showers | 17 to 22 mph NE | 39% |
| Friday | 66°F | Chance Rain Showers | 16 to 21 mph N | 38% |
| Friday Night | 53°F | Chance Rain Showers | 21 mph N | 36% |
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 Sep 19, 2026.