TODAY JUN04
TEMPERATURE85
HUMIDITY51
PRESSURE29.78
WIND COND.
  • 8659Fri30%30%
  • 6654Sat
  • 6658Sun
  • 7564Mon
  • 8365Tue
daynightWeather update from Chicago / Wheeling, Pal-Waukee Airport at
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Winnetka 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
January18°F33°F25°F4.0"
February13°F30°F22°F3.3"
March25°F45°F35°F3.0"
April35°F60°F48°F2.7"
May43°F71°F57°F3.9"
June55°F83°F70°F5.1"
July56°F83°F71°F4.4"
August59°F83°F71°F3.9"
September49°F78°F63°F1.9"
October42°F66°F54°F2.3"
November28°F49°F39°F5.0"
December19°F32°F26°F3.5"

Did you know?

  • The highest monthly average temperature in Winnetka for August is 71 degrees.
  • The lowest monthly average temperature in Winnetka for February is 22 degrees.
  • The most monthly precipitation in Winnetka occurs in June with 5.1 inches.
  • The air quality index in Winnetka is 21% worse than the national average.
  • The pollution index in Winnetka is 25% better than the national average.

Compare Winnetka, IL Weather To Other Cities

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      Winnetka 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.
      IndexWinnetkaIllinoisNational
      Air quality index604150
      Pollution index3,795,4103,347,2955,066,862

      Winnetka 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

      Winnetka air quality information

      PollutantTotal
      Arsenic0.030%
      Benzene0.050%
      Carbon Tetrachloride0.010%
      Lead0.003%
      Mercury0.310%

      Average monthly Winnetka temperature with heat index

      Winnetka monthly precipitation with daily maximum

      Winnetka monthly snow depth with daily maximum

      Winnetka monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Mundelein, IL31,5503530%
      North Chicago, IL30,0233530%
      Libertyville, IL20,4353530%
      Knollwood, IL1,7293530%
      Green Oaks, IL3,8323530%
      Winnetka, IL12,4376020%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Powell, OH12,4364314%
      New Providence, NJ12,434536%
      Wilmington, OH12,4413726%
      Ottawa, KS12,4333628%
      Lakeland Highlands, FL12,4263628%
      Winnetka, IL12,4376020%
      Source: The Winnetka, 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.