Greenlawn, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Greenlawn, a community in Suffolk County, New York.
This Afternoon
80°F
Sunny
Sunny. High near 80, with temperatures falling to around 77 in the afternoon. North wind around 8 mph.
7-day forecast for Greenlawn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 80°F | Sunny | 8 mph N | 0% |
| Tonight | 56°F | Partly Cloudy | 7 to 12 mph N | 0% |
| Saturday | 69°F | Mostly Sunny | 7 to 13 mph E | 0% |
| Saturday Night | 57°F | Mostly Cloudy | 8 mph SE | 7% |
| Sunday | 70°F | Showers And Thunderstorms | 6 to 14 mph S | 82% |
| Sunday Night | 59°F | Showers And Thunderstorms | 7 to 14 mph SW | 89% |
| Monday | 68°F | Rain Showers Likely | 12 to 15 mph NE | 56% |
| Monday Night | 55°F | Chance Rain Showers | 12 to 15 mph NE | 27% |
| Tuesday | 65°F | Chance Rain Showers | 17 mph NE | 26% |
| Tuesday Night | 53°F | Chance Rain Showers then Mostly Cloudy | 18 mph NE | 26% |
| Wednesday | 64°F | Mostly Cloudy then Slight Chance Rain Showers | 20 mph NE | 15% |
| Wednesday Night | 53°F | Chance Rain Showers | 20 mph NE | 36% |
| Thursday | 64°F | Chance Rain Showers | 21 mph NE | 36% |
| Thursday Night | 53°F | Chance Rain Showers | 16 to 20 mph NE | 36% |
Forecast source: National Weather Service (api.weather.gov) for Greenlawn (40.864, -73.366). Updated through the day.
Growing snapshot for Greenlawn
Last spring frost
Apr 9
First fall frost
Nov 10
Growing season
215 days
Hardiness zone
7b
More local growing data for Greenlawn: nearby ZIP 11740 weather · frost dates · planting calendar · New York frost dates
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Climate data from the nearest NOAA station, Centerport, Ny (1.4 mi from Greenlawn). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.