TODAY SEP22
TEMPERATURE65
HUMIDITY84
PRESSURE29.95
WIND COND.270 16.6
  • 7260Tue
  • 7561Wed
  • 7560Thu
  • 7160Fri
  • 7261Sat
daynightWeather update from Los Angeles, Los Angeles International Airport at

Key findings

  • The highest monthly average temperature in Westchester for August is 73 degrees
  • The lowest monthly average temperature in Westchester for December is 57 degrees
  • The most monthly precipitation in Westchester occurs in January with 3.5 inches
  • The air quality index in Westchester is 45% worse than the national average
  • The pollution index in Westchester is 16% better than the national average

Compare Los Angeles, CA Weather

      vs
      How would you rate the weather in Westchester?
      Write a review to give others more information about this area.
      How would you rate the air quality in Westchester?
      Write a review to give others more information about this area.
      See all Westchester poll results

      Westchester 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
      January48°F70°F58°F3.5"
      February50°F70°F59°F2.9"
      March52°F72°F61°F1.5"
      April55°F74°F63°F0.7"
      May58°F75°F65°F0.5"
      June61°F78°F68°F0.0"
      July65°F83°F72°F0.0"
      August65°F84°F73°F0.0"
      September64°F85°F72°F0.3"
      October60°F81°F69°F0.7"
      November54°F75°F63°F0.8"
      December48°F69°F57°F2.8"

      Westchester 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.
      IndexWestchesterLos AngelesCalifornia
      Air quality index727255
      Pollution index4,251,410139,490,00018,106,726

      Westchester air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality66
      Days with moderate air quality208
      Days w/ poor A.Q. for sensitive groups62
      Days with unhealthy air quality28

      Westchester air quality information

      PollutantTotal
      Arsenic0.200%
      Benzene0.950%
      Carbon Tetrachloride0.080%
      Lead1.320%
      Mercury0.440%

      Average monthly Westchester temperature with heat index

      Westchester monthly precipitation with daily maximum

      Westchester monthly snow depth with daily maximum

      Westchester monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Alondra Park, CA8,1467244%
      Calabasas, CA24,0917244%
      Cudahy, CA24,1067244%
      East Rancho Dominguez, CA15,8877244%
      Glendale, CA197,8957244%
      Los Angeles, CA3,918,8727244%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Chicago, IL2,714,0175510%
      Houston, TX2,240,582524%
      Philadelphia, PA1,559,938512%
      Phoenix, AZ1,555,3247448%
      San Antonio, TX1,439,358492%
      Los Angeles, CA3,918,8727244%
      Source: The Westchester, Los Angeles, CA 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.