All Countries
Islip, NY
Full City Profile · New York · Nassau County County
3.5
/5.0
B+
Good
17,224
Population
3,626/sq mi density
$122,596
Median Income
$49,289 per capita
$486,900
Home Value
$647,268 Zillow
$2,192
Median Rent
51.0% income on rent
53°F
Avg Temperature
275 sunny days/yr
22
Violent Crime/100K
356 property/100K
B+
Overall
3.5 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.8 / 5.0
$122,596 median income, 3.3% unemployment
A
Affordability
4.4 / 5.0
$486,900 home value, $2,192/mo rent
F
Safety
1.0 / 5.0
22 violent crimes/100K
B+
Education
3.8 / 5.0
35.0% bachelor's degree or higher
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. The area gets 275 sunny days per year. Annual precipitation totals 49.9 inches. Air quality is rated Good with a median AQI of 36.
Temperature
32°F Jan (0°C)
75°F Jul (24°C)
| Annual Average | 53.1°F |
| 2% below US avg | |
| January Average | 32°F (0°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 15 ft (5 m) |
| Area | 4.9 sq mi (12.7 km²) |
| Population Density | 3,626/sq mi |
| Coordinates | 40.7303°N, 73.2161°W |
| Timezone | America/New_York |
| County | Nassau County County |
| Nearest Airport | John F Kennedy International (JFK) 30 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 36.0 |
| Rating | Good |
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 | — | 13 km |
| 1895 | HIGH BRIDGE, NJ | Earthquake | — | — | 141 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 32°F (0°C) | 3.5 in | Coldest |
| February | 32°F (0°C) | 3.0 in | |
| March | 40°F (5°C) | 4.1 in | Wettest |
| April | 50°F (10°C) | 3.8 in | |
| May | 60°F (15°C) | 3.5 in | |
| June | 69°F (20°C) | 2.9 in | Driest |
| July | 75°F (24°C) | 3.1 in | Warmest |
| August | 73°F (23°C) | 3.9 in | |
| September | 66°F (19°C) | 3.2 in | |
| October | 55°F (13°C) | 3.2 in | |
| November | 46°F (8°C) | 3.8 in | |
| December | 36°F (2°C) | 3.7 in |
Islip has a seasonal temperature swing of 42°F / from 32°F in January to 75°F in July. Total annual precipitation is 41.7 inches, with March being the wettest month (4.1") and June the driest (2.9").