TODAY MAY09
TEMPERATURE48
HUMIDITY53
PRESSURE30.04
WIND COND.100 20.5
  • 4939Sun100%
  • 5436Mon
  • 5937Tue
  • 6442Wed
  • 6545Thu
daynightWeather update from Lewis University Airport at

Key findings

  • The highest monthly average temperature in Naperville for July is 73.4 degrees
  • The lowest monthly average temperature in Naperville for January is 24.4 degrees
  • The most monthly precipitation in Naperville occurs in August with 7.7 inches
  • The air quality index in Naperville is 11% worse than the national average
  • The pollution index in Naperville is 196% worse than the national average

Compare Naperville, IL Weather

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      Naperville 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
      January17°F32°F24°F3.1"
      February18°F34°F26°F3.0"
      March31°F49°F39°F5.2"
      April40°F62°F50°F4.8"
      May51°F73°F61°F5.9"
      June60°F82°F70°F6.7"
      July64°F84°F73°F4.1"
      August62°F82°F71°F7.7"
      September55°F76°F65°F3.2"
      October44°F64°F53°F7.3"
      November33°F50°F41°F3.9"
      December22°F36°F29°F3.7"

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

      Naperville 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

      Naperville air quality information

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

      Average monthly Naperville temperature with heat index

      Naperville monthly precipitation with daily maximum

      Naperville monthly snow depth with daily maximum

      Naperville monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Oswego, IL33,2450100%
      Sugar Grove, IL9,2880100%
      Montgomery, IL19,0550100%
      Plattville, IL2540100%
      Prestbury, IL1,7800100%
      Naperville, IL145,7895510%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Frisco, TX145,646512%
      Clarksville, TN146,2814020%
      Metairie, LA144,7724510%
      Savannah, GA144,7173922%
      Paterson, NJ146,894512%
      Naperville, IL145,7895510%
      Source: The Naperville, 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.