TODAY APR19
TEMPERATURE45
HUMIDITY82
PRESSURE102240
WIND COND.50 16.6
  • 6642Sat70%
  • 5843Sun
  • 6142Mon
  • 5947Tue
  • 6038Wed50%50%
daynightWeather update from Islip, Long Island Mac Arthur Airport at
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Weather Quick Facts

  • The highest monthly average temperature in St. James for July is 75.9 degrees
  • The lowest monthly average temperature in St. James for January is 32.3 degrees
  • The most monthly precipitation in St. James occurs in August with 5.6 inches
  • The air quality index in St. James is 2% worse than the national average
  • The pollution index in St. James is 1338% worse than the national average

Compare St. James, NY Weather

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      St. James 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
      January24°F41°F32°F4.0"
      February24°F43°F33°F3.0"
      March31°F50°F40°F4.2"
      April41°F61°F50°F3.5"
      May51°F71°F60°F3.6"
      June60°F79°F69°F4.7"
      July68°F85°F76°F3.1"
      August65°F83°F74°F5.6"
      September60°F78°F68°F3.1"
      October49°F67°F58°F4.1"
      November37°F56°F46°F3.0"
      December31°F47°F39°F4.9"

      St. James 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.
      IndexSt. JamesNew YorkNational
      Air quality index434342
      Pollution index39,208,8006,179,2752,726,193

      St. James air quality information

      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

      St. James air quality information

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

      Average monthly St. James temperature with heat index

      St. James monthly precipitation with daily maximum

      St. James monthly snow depth with daily maximum

      St. James monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Bayport, NY8,5844314.0%
      Brentwood, NY62,7434314.0%
      Holbrook, NY25,7944314.0%
      Ronkonkoma, NY18,9534314.0%
      Gordon Heights, NY4,1794314.0%
      St. James, NY13,5334314.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Federal Heights, CO13,5375816.0%
      Ridge, NY13,5374314.0%
      Bay St. Louis, MS13,5394216.0%
      Sault Ste. Marie, MI13,5263236.0%
      Huntington, VA13,526476.0%
      St. James, NY13,5334314.0%
      Source: The St. James, 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.