TODAY AUG21
TEMPERATURE73
HUMIDITY90
PRESSURE29.79
WIND COND.310 10.3
  • 7760Wed
  • 7962Thu
  • 7766Fri30%
  • 8572Sat
  • 9172Sun
daynightWeather update from Chicago, Chicago Midway Airport at

Westchester Average Weather

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"

Did you know?

  • 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 20% worse than the national average.
  • The pollution index in Westchester is 195% worse than the national average.

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Compare Westchester, IL Weather To Other Cities

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 index604150
Pollution index14,981,3003,347,2955,066,862

Westchester air quality information

MeasurementTotal
Days measured365
Days with good air quality72
Days with moderate air quality281
Days w/ poor A.Q. for sensitive groups11
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.
Oak Park, IL51,9896020%
Park Ridge, IL37,5676020%
Riverside, IL8,7796020%
Rosemont, IL4,7156020%
Stickney, IL6,7786020%
Westchester, IL16,7196020%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Morganton, NC16,7173824%
Wolf Trap, VA16,722492%
Defiance, OH16,7253040%
Centerville, UT16,727476%
Center Point, AL16,71150= 100
Westchester, IL16,7196020%
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.