Islip, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Islip, a community in Suffolk County, New York.
This Afternoon
69°F
Partly Sunny
Partly sunny. High near 69, with temperatures falling to around 63 in the afternoon. Southwest wind around 8 mph.
7-day forecast for Islip
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Partly Sunny | 8 mph SW | 0% |
| Tonight | 54°F | Patchy Fog | 3 to 7 mph SW | 3% |
| Wednesday | 70°F | Patchy Fog then Sunny | 3 to 12 mph SW | 3% |
| Wednesday Night | 59°F | Partly Cloudy | 6 to 9 mph S | 2% |
| Thursday | 69°F | Slight Chance Rain Showers | 6 to 13 mph S | 19% |
| Thursday Night | 60°F | Rain Showers | 7 to 10 mph SW | 83% |
| Friday | 68°F | Showers And Thunderstorms | 8 mph SW | 92% |
| Friday Night | 55°F | Showers And Thunderstorms | 6 mph W | 92% |
| Saturday | 65°F | Rain Showers Likely | 6 to 9 mph NW | 59% |
| Saturday Night | 44°F | Slight Chance Rain Showers | 9 mph NW | 19% |
| Sunday | 60°F | Slight Chance Rain Showers then Mostly Sunny | 10 mph W | 18% |
| Sunday Night | 41°F | Partly Cloudy then Slight Chance Light Rain | 9 mph W | 15% |
| Monday | 59°F | Chance Light Rain | 10 to 16 mph NW | 26% |
| Monday Night | 40°F | Chance Light Rain | 13 mph W | 26% |
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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Brentwood
Bridgehampton
Brightwaters
Brookhaven
Calverton
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Center Moriches
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Central Islip
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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 Nov 4, 2026.