TODAY NOV25
TEMPERATURE42
HUMIDITY59
PRESSURE101830
WIND COND.270 9.4
  • 5934Tue80%
  • 5039Wed
  • 503680%70%
  • 4728Fri30%
  • 4127Sat
daynightWeather update from Newark, Newark International Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Iselin for July is 78.1 degrees
  • The lowest monthly average temperature in Iselin for February is 32.4 degrees
  • The most monthly precipitation in Iselin occurs in May with 9.9 inches
  • The air quality index in Iselin is 21% worse than the national average
  • The pollution index in Iselin is 371% worse than the national average

Compare Iselin, NJ Weather

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      Iselin 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°F42°F34°F6.3"
      February24°F42°F32°F4.9"
      March31°F50°F40°F7.3"
      April46°F67°F55°F5.0"
      May56°F76°F65°F9.9"
      June64°F83°F73°F8.3"
      July71°F87°F78°F8.3"
      August67°F84°F75°F7.8"
      September61°F80°F70°F4.9"
      October54°F72°F62°F6.3"
      November38°F56°F46°F5.9"
      December33°F46°F39°F5.8"

      Iselin 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.
      IndexIselinNew JerseyNational
      Air quality index514542
      Pollution index12,837,2007,246,8912,726,193

      Iselin air quality

      MeasurementTotal
      Days measured365
      Days with good air quality169
      Days with moderate air quality180
      Days w/ poor A.Q. for sensitive groups16
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.010%
      Benzene0.110%
      Carbon Tetrachloride0.050%
      Lead0.020%
      Mercury0.230%

      Average monthly Iselin temperature with heat index

      Iselin monthly precipitation with daily maximum

      Iselin monthly snow depth with daily maximum

      Iselin monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Mendham, NJ4,8803432.0%
      Highland Park, NJ13,8034118.0%
      New Brunswick, NJ55,9924118.0%
      Society Hill, NJ3,4954118.0%
      Spotswood, NJ8,2554118.0%
      Iselin, NJ17,356512.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Hinsdale, IL17,3665510.0%
      Oswego, NY17,3713726.0%
      L'Ancienne-Lorette, QC17,373n/a 
      Nederland, TX17,3344510.0%
      Estelle, LA17,3304510.0%
      Iselin, NJ17,356512.0%
      Source: The Iselin, NJ 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.