Islip, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Islip, a community in Suffolk County, New York.
Tonight
56°F
Partly Cloudy
Partly cloudy. Low around 56, with temperatures rising to around 58 overnight. North wind 6 to 12 mph.
7-day forecast for Islip
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Partly Cloudy | 6 to 12 mph N | 0% |
| Saturday | 70°F | Mostly Sunny | 12 mph E | 0% |
| Saturday Night | 58°F | Mostly Cloudy | 6 to 9 mph SE | 3% |
| Sunday | 71°F | Showers And Thunderstorms Likely | 8 to 16 mph S | 74% |
| Sunday Night | 60°F | Showers And Thunderstorms | 8 to 13 mph W | 90% |
| Monday | 69°F | Rain Showers Likely | 15 mph NE | 63% |
| Monday Night | 55°F | Chance Rain Showers | 12 to 15 mph NE | 28% |
| Tuesday | 66°F | Chance Rain Showers | 16 to 20 mph NE | 27% |
| Tuesday Night | 54°F | Chance Rain Showers then Mostly Cloudy | 18 mph NE | 27% |
| Wednesday | 65°F | Slight Chance Rain Showers | 18 to 22 mph NE | 18% |
| Wednesday Night | 54°F | Chance Rain Showers | 17 to 21 mph NE | 36% |
| Thursday | 65°F | Chance Rain Showers | 21 mph NE | 36% |
| Thursday Night | 54°F | Chance Rain Showers | 14 to 18 mph NE | 36% |
| Friday | 68°F | Chance Rain Showers | 17 mph N | 36% |
Forecast source: National Weather Service (api.weather.gov) for Islip (40.730, -73.216). Updated through the day.
Growing snapshot for Islip
Last spring frost
Apr 4
First fall frost
Nov 11
Growing season
219 days
Hardiness zone
7b
More local growing data for Islip: nearby ZIP 11751 weather · frost dates · planting calendar · New York frost dates
Nearby towns & communities
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Belle Terre
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Brentwood
Bridgehampton
Brightwaters
Brookhaven
Calverton
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Center Moriches
Centereach
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Central Islip
Cold Spring Harbor
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Climate data from the nearest NOAA station, Molloy Cercom, Ny (6.5 mi from Islip). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.