TODAY MAR29
TEMPERATURE39
HUMIDITY52
PRESSURE101800
WIND COND.10 5.4
  • 5946Fri90%
  • 5939Sat30%
  • 5143Sun30%90%
  • 5340Mon
  • 5033Tue
daynightWeather update from Lewis University Airport at
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Weather Quick Facts

  • 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 31% worse than the national average
  • The pollution index in Naperville is 450% 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 index554142
      Pollution index14,981,3003,148,6942,726,193

      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

      CityPopulationAir Quality IndexNational Avg.
      Montgomery, IL19,5150100.0%
      Plattville, IL1900100.0%
      Prestbury, IL1,9780100.0%
      Yorkville, IL19,3860100.0%
      Oswego, IL35,4700100.0%
      Naperville, IL147,7345510.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Guelph, ON147,931n/a 
      Rockford, IL147,4414216.0%
      Joliet, IL147,3235510.0%
      Killeen, TX148,5734216.0%
      Bellevue, WA146,1454510.0%
      Naperville, IL147,7345510.0%
      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.