Barnum Island, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Barnum Island, a community in Nassau County, New York.
Today
81°F
Mostly Sunny
Mostly sunny, with a high near 81. East wind 3 to 7 mph.
7-day forecast for Barnum Island
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Mostly Sunny | 3 to 7 mph E | 0% |
| Tonight | 69°F | Mostly Cloudy | 2 to 6 mph E | 4% |
| Wednesday | 81°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 2 to 8 mph E | 21% |
| Wednesday Night | 73°F | Slight Chance Showers And Thunderstorms | 5 to 8 mph S | 17% |
| Thursday | 85°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 14 mph S | 18% |
| Thursday Night | 74°F | Chance Showers And Thunderstorms then Partly Cloudy | 6 to 14 mph SW | 27% |
| Friday | 86°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 6 to 12 mph SW | 21% |
| Friday Night | 74°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 6 to 10 mph SW | 35% |
| Saturday | 83°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 6 to 10 mph SW | 24% |
| Saturday Night | 73°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 6 to 10 mph SW | 29% |
| Sunday | 83°F | Mostly Sunny | 6 to 10 mph SW | 10% |
| Sunday Night | 74°F | Mostly Clear | 7 to 10 mph SW | 10% |
| Monday | 85°F | Sunny | 7 to 12 mph SW | 10% |
| Monday Night | 74°F | Partly Cloudy | 7 to 12 mph W | 14% |
Forecast source: National Weather Service (api.weather.gov) for Barnum Island (40.605, -73.643). Updated through the day.
Growing snapshot for Barnum Island
Last spring frost
Apr 7
First fall frost
Nov 8
Growing season
212 days
Hardiness zone
7b
More local growing data for Barnum Island: nearby ZIP 11558 weather · frost dates · planting calendar · New York frost dates
Nearby towns & communities
Albertson
Atlantic Beach
Baldwin
Baxter Estates
Bay Park
Bayville
Bellerose
Bellmore
Bethpage
Brookville
Carle Place
Cedarhurst
Centre Island
Cove Neck
East Atlantic Beach
East Hills
East Massapequa
East Meadow
East Norwich
East Rockaway
East Williston
Elmont
Floral Park
Flower Hill
Franklin Square
Freeport
Garden City
Garden City Park
Garden City South
Glen Cove
Climate data from the nearest NOAA station, Oceanside, Ny (2.2 mi from Barnum Island). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.