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
68°F
Partly Sunny
Partly sunny. High near 68, with temperatures falling to around 63 in the afternoon. Southwest wind around 10 mph.
7-day forecast for Greenlawn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Partly Sunny | 10 mph SW | 0% |
| Tonight | 52°F | Patchy Fog | 3 to 7 mph SW | 3% |
| Wednesday | 71°F | Patchy Fog then Sunny | 3 to 12 mph SW | 3% |
| Wednesday Night | 58°F | Partly Cloudy | 6 to 9 mph S | 2% |
| Thursday | 70°F | Chance Rain Showers | 6 to 12 mph S | 25% |
| Thursday Night | 60°F | Rain Showers | 6 to 9 mph SW | 82% |
| Friday | 67°F | Showers And Thunderstorms | 7 mph SW | 90% |
| Friday Night | 55°F | Showers And Thunderstorms then Light Rain Likely | 7 mph W | 90% |
| Saturday | 64°F | Light Rain Likely | 8 mph NW | 57% |
| Saturday Night | 44°F | Slight Chance Light Rain | 9 mph NW | 19% |
| Sunday | 59°F | Slight Chance Light Rain then Mostly Sunny | 9 mph W | 18% |
| Sunday Night | 41°F | Partly Cloudy | 9 mph W | 13% |
| Monday | 58°F | Chance Light Rain | 9 to 15 mph NW | 25% |
| Monday Night | 41°F | Chance Light Rain | 13 mph W | 25% |
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 Nov 3, 2026.