Skip to content
VSWeather

West Islip, NY weather and climate

Suffolk County, NY · population 26,559 · about 20 ft elevation

Everything below is a 30 year average for 1991-2020, computed from daily climate history at West Islip's own coordinates.

The year at a glance

Sunny days
205
clear or partly cloudy, per year
Precipitation
47 in
per year
Wet days
121
rain or snow per year
Snowfall
27 in
per year
Hot days
8
above 90 °F
Freezing nights
83
at or below 32 °F
Humidity
74%
average relative
Average temperature
54 °F
year round

Monthly temperatures

Average daily high and low for each month, in °F.

Daily highDaily low
406080JanMarMayJulSepNovDaily high, Jan: 39 °FDaily high, Feb: 41 °FDaily high, Mar: 48 °FDaily high, Apr: 58 °FDaily high, May: 67 °FDaily high, Jun: 77 °FDaily high, Jul: 83 °FDaily high, Aug: 82 °FDaily high, Sep: 75 °FDaily high, Oct: 64 °FDaily high, Nov: 54 °FDaily high, Dec: 45 °FDaily low, Jan: 26 °FDaily low, Feb: 27 °FDaily low, Mar: 33 °FDaily low, Apr: 42 °FDaily low, May: 52 °FDaily low, Jun: 62 °FDaily low, Jul: 68 °FDaily low, Aug: 67 °FDaily low, Sep: 60 °FDaily low, Oct: 49 °FDaily low, Nov: 39 °FDaily low, Dec: 31 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high394148586777838275645445
Daily low262733425262686760493931

Monthly precipitation

Total rain plus melted snow for each month, in inches.

0.02.04.0JanMarMayJulSepNovWest Islip, Jan: 3.8 inWest Islip, Feb: 3.5 inWest Islip, Mar: 4.6 inWest Islip, Apr: 3.8 inWest Islip, May: 3.5 inWest Islip, Jun: 3.6 inWest Islip, Jul: 3.3 inWest Islip, Aug: 3.9 inWest Islip, Sep: 3.8 inWest Islip, Oct: 4.4 inWest Islip, Nov: 3.7 inWest Islip, Dec: 4.8 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
West Islip3.83.54.63.83.53.63.33.93.84.43.74.8

Monthly sunny days

Days each month with clear or partly cloudy skies.

01020JanMarMayJulSepNovWest Islip, Jan: 17 daysWest Islip, Feb: 16 daysWest Islip, Mar: 17 daysWest Islip, Apr: 16 daysWest Islip, May: 15 daysWest Islip, Jun: 16 daysWest Islip, Jul: 19 daysWest Islip, Aug: 19 daysWest Islip, Sep: 18 daysWest Islip, Oct: 19 daysWest Islip, Nov: 17 daysWest Islip, Dec: 17 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
West Islip171617161516191918191717

Compare West Islip with another city

Nearby cities and popular picks. Any two cities can be compared from the home page.

See weather for every covered New York city

About this data

Figures are 30 year averages for 1991-2020. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.

Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).