TODAY OCT20
TEMPERATURE53
HUMIDITY80
PRESSURE29.85
WIND COND.280 6.9
  • 4730Sat40%
  • 4939Sun
  • 5840Mon
  • 5137Tue
  • 5138Wed
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 20% worse than the national average.
  • The pollution index in Winnetka is 25% better than the national average.

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Compare Winnetka, IL Weather To Other Cities

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.
Knollwood, IL1,7293530%
Green Oaks, IL3,8323530%
Lake Bluff, IL5,7583530%
Libertyville, IL20,4353530%
Mundelein, IL31,5503530%
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.