West Islip, NY
Full City Profile · New York · Nassau County County
4.8
/5.0
A+
Excellent
26,559
Population
4,361/sq mi density
$171,045
Median Income
$66,182 per capita
$592,700
Home Value
$774,423 Zillow
$2,613
Median Rent
31.4% income on rent
53°F
Avg Temperature
A+
Overall
4.8 / 5.0
Strong
A+
Economy
4.7 / 5.0
$171,045 median income, 3.7% unemployment
A+
Affordability
4.7 / 5.0
$592,700 home value, $2,613/mo rent
A+
Education
5.0 / 5.0
50.1% bachelor's degree or higher
West Islip experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 32°F in January while summers reach 75°F in July. Annual precipitation totals 38.3 inches. The area receives 31.8 inches of snow annually. Air quality is rated Good with a median AQI of 31.
Temperature
32°F Jan (0°C)
75°F Jul (24°C)
| Annual Average | 53.4°F |
| 1% below US avg | |
| January Average | 32°F (0°C) |
| July Average | 75°F (24°C) |
Geography
| Elevation | 16 ft (5 m) |
| Area | 6.8 sq mi (17.5 km²) |
| Population Density | 4,361/sq mi |
| Coordinates | 40.7029°N, 73.2955°W |
| Timezone | America/New_York |
| County | Nassau County County |
| Nearest Airport | John F Kennedy International (JFK) 26 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 31.0 |
| Rating | Good |
| Good Days % | 84.2% |
| Unhealthy Days | 0 |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 97.1 / 100 |
| Social Vulnerability | 25.9 / 100 |
| Community Resilience | 97.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively High |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very High |
| Lightning | Very High |
| Ice Storm | Very High |
| Drought | Very Low |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
| Coastal Flood | Very High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
2 tsunamis recorded within 500 km. Highest wave on record: 0.3 m (1 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1964 | LONG ISLAND, NY | Meteorological | 0.3 m | - | 20 km |
| 1895 | HIGH BRIDGE, NJ | Earthquake | - | - | 134 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 32°F (0°C) | 2.7 in | Coldest |
| February | 34°F (1°C) | 2.0 in | Driest |
| March | 40°F (5°C) | 3.5 in | |
| April | 50°F (10°C) | 3.6 in | |
| May | 60°F (15°C) | 3.2 in | |
| June | 69°F (21°C) | 3.5 in | |
| July | 75°F (24°C) | 3.1 in | Warmest |
| August | 74°F (23°C) | 3.3 in | |
| September | 67°F (20°C) | 3.7 in | Wettest |
| October | 56°F (13°C) | 3.4 in | |
| November | 46°F (8°C) | 2.9 in | |
| December | 38°F (3°C) | 3.6 in |
West Islip has a seasonal temperature swing of 43°F / from 32°F in January to 75°F in July. Total annual precipitation is 38.3 inches, with September being the wettest month (3.7") and February the driest (2.0").