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West Islip, United States Snapshot 2026
Where is West Islip?
West Islip, United States
- Continent
- Americas
- Country
- United States
- City
- West Islip
- Population
- 28.3K
- Elevation
- 6 m
- Coordinates
- 40.71°, -73.31°
West Islip is a city in United States with a population of approximately 28.3K. Average temperatures range from 0°C (31°F) in January to 27°C (80°F) in July. The best time to visit is June, July, August, September, October.
Time in West Islip right now
Open full time & time zone page 15:27 27
Monday, June 15, 2026
IANA time zone
America/New_York
Daylight saving
DST in effect
EST / EDT
Next DST change
November 1
backward -1h
Live weather in West Islip
Daylight in West Islip today
View full sunrise & sunset page Sunrise
Sunset
Day length
15h 04m
Climate normals for West Islip
Long-term monthly averages based on historical data.
January
Poor 
February
Poor March
Poor April
Fair May
Good June best
Excellent July best
Excellent August best
Excellent September best
Excellent October best
Good November
Fair December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 5°C / 0°C | 0°C / -6°C | 10days (101 mm) Wet | 6.1h Fair | 69% Muggy | 2.4 Moderate | Poor | View Details |
| February | 6°C / 0°C | 2°C / -5°C | 10days (103 mm) Wet | 6.8h Fair | 72% Muggy | 3.3 Moderate | Poor | View Details |
| March | 9°C / 3°C | 5°C / -3°C | 11days (111 mm) Wet | 8.4h Good | 70% Muggy | 4.6 Moderate | Poor | View Details |
| April | 13°C / 7°C | 11°C / 3°C | 11days (111 mm) Wet | 9.2h Good | 73% Muggy | 5.4 High | Fair | View Details |
| May | 18°C / 12°C | 17°C / 10°C | 12days (108 mm) Wet | 9.9h Good | 78% Humid | 6.3 High | Good | View Details |
| June best | 23°C / 18°C | 25°C / 18°C | 9days (73 mm) Wet | 11.6h Excellent | 78% Humid | 7.1 Very High | Excellent | View Details |
| July best | 27°C / 23°C | 30°C / 24°C | 11days (102 mm) Wet | 11.9h Excellent | 80% Humid | 7.4 Very High | Excellent | View Details |
| August best | 26°C / 22°C | 29°C / 23°C | 10days (88 mm) Wet | 11h Excellent | 78% Humid | 6.6 High | Excellent | View Details |
| September best | 23°C / 19°C | 24°C / 18°C | 9days (106 mm) Wet | 9.1h Good | 77% Humid | 5.1 High | Excellent | View Details |
| October best | 18°C / 13°C | 17°C / 11°C | 10days (123 mm) Wet | 7.7h Good | 74% Muggy | 4.1 Moderate | Good | View Details |
| November | 12°C / 7°C | 9°C / 2°C | 8days (89 mm) Wet | 7h Good | 69% Muggy | 2.9 Moderate | Fair | View Details |
| December | 7°C / 2°C | 3°C / -3°C | 11days (132 mm) Wet | 5.7h Fair | 71% Muggy | 2.1 Moderate | Poor | View Details |
Monthly Temperatures
HighLow
Line chart showing monthly temperatures. Jan: 5°C / 0°C . Feb: 6°C / 0°C . Mar: 9°C / 3°C . Apr: 13°C / 7°C . May: 18°C / 12°C . Jun: 23°C / 18°C . Jul: 27°C / 23°C . Aug: 26°C / 22°C . Sep: 23°C / 19°C . Oct: 18°C / 13°C . Nov: 12°C / 7°C . Dec: 7°C / 2°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 101 mm. Feb: 103 mm. Mar: 111 mm. Apr: 111 mm. May: 108 mm. Jun: 73 mm. Jul: 102 mm. Aug: 88 mm. Sep: 106 mm. Oct: 123 mm. Nov: 89 mm. Dec: 132 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 69%. Feb: 72%. Mar: 70%. Apr: 73%. May: 78%. Jun: 78%. Jul: 80%. Aug: 78%. Sep: 77%. Oct: 74%. Nov: 69%. Dec: 71%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 28 km/h . Feb: 27 km/h . Mar: 28 km/h . Apr: 27 km/h . May: 23 km/h . Jun: 22 km/h . Jul: 21 km/h . Aug: 21 km/h . Sep: 22 km/h . Oct: 25 km/h . Nov: 28 km/h . Dec: 28 km/h .
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 5°C . Feb: 5°C . Mar: 6°C . Apr: 9°C . May: 14°C . Jun: 18°C . Jul: 23°C . Aug: 22°C . Sep: 22°C . Oct: 18°C . Nov: 13°C . Dec: 8°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 5. Apr: UV 5. May: UV 6. Jun: UV 7. Jul: UV 7. Aug: UV 7. Sep: UV 5. Oct: UV 4. Nov: UV 3. Dec: UV 2.
Frequently Asked Questions
West Islip has a population of approximately 28.3K.
The best months to visit West Islip are June, July, August, September, October, when temperatures are pleasant and rainfall is lower.
West Islip receives approximately 1247mm of rainfall annually across 122 rainy days.
West Islip is located in United States, in the Americas region.
West Islip sits at an elevation of 6 m (20 ft) above sea level.