Holtsville, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Holtsville, a community in Suffolk County, New York.
This Afternoon
68°F
Sunny
Sunny. High near 68, with temperatures falling to around 63 in the afternoon. South wind around 7 mph.
7-day forecast for Holtsville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Sunny | 7 mph S | 0% |
| Tonight | 58°F | Mostly Cloudy | 7 mph S | 2% |
| Thursday | 69°F | Slight Chance Light Rain | 6 to 13 mph SW | 18% |
| Thursday Night | 60°F | Light Rain Likely | 6 to 12 mph SW | 74% |
| Friday | 68°F | Rain | 6 mph SW | 77% |
| Friday Night | 53°F | Rain | 3 mph W | 77% |
| Saturday | 64°F | Mostly Sunny | 3 to 8 mph W | 14% |
| Saturday Night | 43°F | Slight Chance Light Rain | 7 to 10 mph W | 24% |
| Sunday | 59°F | Slight Chance Light Rain then Mostly Sunny | 9 to 13 mph NW | 24% |
| Sunday Night | 41°F | Partly Cloudy | 10 mph W | 1% |
| Monday | 58°F | Sunny | 12 to 15 mph W | 4% |
| Monday Night | 40°F | Mostly Clear | 6 to 10 mph W | 4% |
| Tuesday | 61°F | Sunny | 9 to 13 mph W | 1% |
| Tuesday Night | 40°F | Mostly Clear | 8 mph W | 1% |
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 Nov 5, 2026.