South Valley Stream, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for South Valley Stream, a community in Nassau County, New York.
Today
83°F
Mostly Sunny
Mostly sunny. High near 83, with temperatures falling to around 80 in the afternoon. East wind 3 to 7 mph.
7-day forecast for South Valley Stream
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Mostly Sunny | 3 to 7 mph E | 0% |
| Tonight | 69°F | Mostly Cloudy | 2 to 6 mph E | 4% |
| Wednesday | 83°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 2 to 9 mph SE | 24% |
| Wednesday Night | 73°F | Slight Chance Showers And Thunderstorms | 5 to 8 mph S | 19% |
| Thursday | 87°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 13 mph S | 25% |
| Thursday Night | 75°F | Chance Showers And Thunderstorms then Partly Cloudy | 6 to 12 mph SW | 32% |
| Friday | 89°F | Mostly Sunny then Chance Showers And Thunderstorms | 6 to 10 mph SW | 28% |
| Friday Night | 74°F | Chance Showers And Thunderstorms | 5 to 9 mph SW | 35% |
| Saturday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 to 9 mph SW | 29% |
| Saturday Night | 74°F | Chance Showers And Thunderstorms | 5 to 8 mph SW | 30% |
| Sunday | 87°F | Mostly Sunny then Slight Chance Rain Showers | 5 to 9 mph SW | 15% |
| Sunday Night | 75°F | Slight Chance Rain Showers then Mostly Clear | 5 to 8 mph SW | 15% |
| Monday | 91°F | Sunny | 5 to 12 mph SW | 10% |
| Monday Night | 74°F | Partly Cloudy | 6 to 10 mph W | 14% |
Forecast source: National Weather Service (api.weather.gov) for South Valley Stream (40.656, -73.719). Updated through the day.
Growing snapshot for South Valley Stream
Last spring frost
Apr 2
First fall frost
Nov 14
Growing season
226 days
Hardiness zone
7b
More local growing data for South Valley Stream: nearby ZIP 11581 weather · frost dates · planting calendar · New York frost dates
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Climate data from the nearest NOAA station, New York Jfk Intl Ap, Ny (2.6 mi from South Valley Stream). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.