TODAY DEC02
TEMPERATURE17
HUMIDITY76
PRESSURE102680
WIND COND.
  • 2817Mon
  • 3125Tue
  • 4113Wed
  • 2313Thu
  • 3022Fri
daynightWeather update from Joliet Regional Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Joliet for July is 74.2 degrees
  • The lowest monthly average temperature in Joliet for January is 25.3 degrees
  • The most monthly precipitation in Joliet occurs in August with 6.8 inches
  • The air quality index in Joliet is 31% worse than the national average
  • The pollution index in Joliet is 43% better than the national average

Compare Joliet, IL Weather

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      Joliet 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°F34°F25°F2.5"
      February19°F36°F27°F2.8"
      March31°F50°F39°F4.5"
      April41°F63°F51°F4.9"
      May50°F73°F61°F4.7"
      June60°F83°F71°F5.4"
      July64°F85°F74°F5.7"
      August62°F83°F72°F6.8"
      September55°F77°F65°F5.4"
      October44°F64°F53°F5.7"
      November33°F51°F41°F4.9"
      December23°F37°F30°F3.7"

      Joliet 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.
      IndexJolietIllinoisNational
      Air quality index554142
      Pollution index1,558,0703,148,6942,726,193

      Joliet air quality

      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

      Air quality details

      PollutantTotal
      Arsenic0.010%
      Benzene0.010%
      Carbon Tetrachloride0.070%
      Lead0.090%
      Mercury0.010%

      Average monthly Joliet temperature with heat index

      Joliet monthly precipitation with daily maximum

      Joliet monthly snow depth with daily maximum

      Joliet monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Shorewood, IL17,3030100.0%
      Oswego, IL35,4700100.0%
      Channahon, IL13,2810100.0%
      Wilmington village, IL1440100.0%
      Minooka, IL11,0690100.0%
      Joliet, IL147,3235510.0%

      Cities with similar population

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