TODAY NOV22
TEMPERATURE41
HUMIDITY79
PRESSURE99260
WIND COND.240 31.7
  • 463830%70%
  • 5140Sat40%
  • 5337Sun
  • 5643Mon
  • 5836Tue30%
daynightWeather update from Farmingdale - Republic Airport at
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Weather Quick Facts

  • The highest monthly average temperature in West Islip for August is 74.8 degrees
  • The lowest monthly average temperature in West Islip for February is 30.8 degrees
  • The most monthly precipitation in West Islip occurs in October with 16.3 inches
  • The air quality index in West Islip is 2% worse than the national average
  • The pollution index in West Islip is 1338% worse than the national average

Compare West Islip, NY Weather

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      West Islip Average Temperature

      In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
      MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
      January26°F41°F33°F4.6"
      February24°F39°F31°F3.2"
      March30°F47°F38°F6.5"
      April41°F59°F49°F10.8"
      May50°F68°F58°F3.5"
      June62°F78°F69°F6.0"
      July67°F82°F74°F8.7"
      August67°F83°F75°F6.0"
      September61°F79°F69°F4.2"
      October52°F68°F59°F16.3"
      November39°F55°F47°F5.8"
      December30°F43°F36°F5.8"

      West Islip air quality index & pollution index

      In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
      IndexWest IslipNew YorkNational
      Air quality index434342
      Pollution index39,208,8006,179,2752,726,193

      West Islip air quality

      MeasurementTotal
      Days measured365
      Days with good air quality262
      Days with moderate air quality82
      Days w/ poor A.Q. for sensitive groups18
      Days with unhealthy air quality3

      Air quality details

      PollutantTotal
      Arsenic0.060%
      Benzene0.320%
      Carbon Tetrachloride0.020%
      Lead0.320%
      Mercury0.130%

      Average monthly West Islip temperature with heat index

      West Islip monthly precipitation with daily maximum

      West Islip monthly snow depth with daily maximum

      West Islip monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Brentwood, NY62,7434314.0%
      North Patchogue, NY8,2024314.0%
      Centerport, NY5,7734314.0%
      Fort Salonga, NY9,9304314.0%
      Huntington Bay, NY1,6144314.0%
      West Islip, NY26,6144314.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Alvin, TX26,592524.0%
      Daphne, AL26,5783726.0%
      Garden City, MI26,5655612.0%
      Brownsburg, IN26,560548.0%
      Wooster, OH26,5574314.0%
      West Islip, NY26,6144314.0%
      Source: The West Islip, NY weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.