Holtsville, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Holtsville, a community in Suffolk County, New York.
Today
82°F
Mostly Sunny
Mostly sunny, with a high near 82. East wind around 6 mph.
7-day forecast for Holtsville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Mostly Sunny | 6 mph E | 0% |
| Tonight | 65°F | Mostly Cloudy | 2 to 6 mph E | 7% |
| Wednesday | 82°F | Partly Sunny | 2 to 7 mph E | 14% |
| Wednesday Night | 71°F | Mostly Cloudy then Slight Chance Rain Showers | 7 mph S | 21% |
| Thursday | 86°F | Mostly Sunny | 5 to 12 mph SW | 11% |
| Thursday Night | 73°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 6 to 12 mph SW | 18% |
| Friday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 6 to 10 mph SW | 16% |
| Friday Night | 72°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 9 mph SW | 30% |
| Saturday | 86°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 20% |
| Saturday Night | 72°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 8 mph SW | 26% |
| Sunday | 87°F | Mostly Sunny | 5 to 9 mph SW | 14% |
| Sunday Night | 72°F | Mostly Clear | 5 to 8 mph SW | 10% |
| Monday | 88°F | Sunny | 5 to 12 mph SW | 8% |
| Monday Night | 72°F | Slight Chance Rain Showers | 5 to 9 mph W | 18% |
Forecast source: National Weather Service (api.weather.gov) for Holtsville (40.812, -73.045). Updated through the day.
Growing snapshot for Holtsville
Last spring frost
Apr 10
First fall frost
Nov 2
Growing season
207 days
Hardiness zone
7b
More local growing data for Holtsville: nearby ZIP 11742 weather · frost dates · planting calendar · New York frost dates
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Climate data from the nearest NOAA station, Islip Li Macarthur Ap, Ny (3.3 mi from Holtsville). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.