TODAY FEB27
TEMPERATURE49
HUMIDITY56
PRESSURE30.05
WIND COND.190 13
  • 5324Sun30%
  • 3719Mon
  • 4333Tue
  • 5434Wed
  • 5434Thu
daynightWeather update from Chicago, Chicago Midway Airport at

Key findings

  • The highest monthly average temperature in Westchester for July is 76 degrees
  • The lowest monthly average temperature in Westchester for January is 26 degrees
  • The most monthly precipitation in Westchester occurs in August with 5.1 inches
  • The air quality index in Westchester is 11% worse than the national average
  • The pollution index in Westchester is 196% worse than the national average

Compare Westchester, IL Weather

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      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
      January20°F34°F26°F1.9"
      February21°F36°F28°F1.6"
      March33°F49°F40°F2.4"
      April42°F62°F51°F3.6"
      May52°F73°F61°F4.3"
      June63°F82°F72°F4.6"
      July68°F86°F76°F3.5"
      August67°F83°F75°F5.1"
      September60°F77°F68°F2.8"
      October48°F65°F55°F3.9"
      November36°F51°F43°F2.2"
      December25°F37°F31°F2.2"

      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.
      IndexWestchesterIllinoisNational
      Air quality index554150
      Pollution index14,981,3003,347,2955,066,862

      Westchester air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality121
      Days with moderate air quality227
      Days w/ poor A.Q. for sensitive groups16
      Days with unhealthy air quality1

      Westchester air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.140%
      Carbon Tetrachloride0.030%
      Lead0.020%
      Mercury0.010%

      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.
      Broadview, IL7,9155510%
      Elmwood Park, IL24,8455510%
      Stickney, IL6,7785510%
      Crestwood, IL10,9895510%
      Riverdale, IL13,0475510%
      Westchester, IL16,7195510%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Morganton, NC16,7174314%
      Wolf Trap, VA16,722476%
      Defiance, OH16,7253922%
      Center Point, AL16,711536%
      Centerville, UT16,727512%
      Westchester, IL16,7195510%
      Source: The Westchester, IL 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.