TODAY MAR28
TEMPERATURE36
HUMIDITY70
PRESSURE102170
WIND COND.290 5.4
  • 6040Thu
  • 7054Fri50%
  • 6946Sat40%30%
  • 6753Sun30%70%
  • 7246Mon70%
daynightWeather update from Decatur Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Illiopolis for August is 78.1 degrees
  • The lowest monthly average temperature in Illiopolis for February is 29.4 degrees
  • The most monthly precipitation in Illiopolis occurs in June with 8.1 inches
  • The air quality index in Illiopolis is 5% worse than the national average
  • The pollution index in Illiopolis is 88% worse than the national average

Compare Illiopolis, IL Weather

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      Illiopolis 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
      January24°F38°F31°F6.8"
      February23°F37°F29°F3.4"
      March35°F56°F45°F3.0"
      April43°F65°F54°F4.2"
      May54°F78°F66°F3.1"
      June64°F86°F75°F8.1"
      July65°F86°F76°F4.0"
      August68°F89°F78°F3.9"
      September59°F85°F72°F7.7"
      October49°F71°F60°F7.1"
      November37°F56°F45°F6.1"
      December24°F37°F30°F2.5"

      Illiopolis 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.
      IndexIlliopolisIllinoisNational
      Air quality index444142
      Pollution index5,136,0803,148,6942,726,193

      Illiopolis air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality255
      Days with moderate air quality110
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Illiopolis air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.090%
      Carbon Tetrachloride0.010%
      Lead0.390%
      Mercury0.020%

      Average monthly Illiopolis temperature with heat index

      Illiopolis monthly precipitation with daily maximum

      Illiopolis monthly snow depth with daily maximum

      Illiopolis monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Edinburg, IL1,0884020.0%
      Dawson, IL7054020.0%
      Elkhart, IL4594020.0%
      Broadwell, IL1884020.0%
      Mechanicsburg, IL9184020.0%
      Illiopolis, IL7674412.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Ravenna, KY7673334.0%
      Midway, LA7673040.0%
      Kimball, MN7673236.0%
      Middleville, NY7672746.0%
      Oak City, UT767468.0%
      Illiopolis, IL7674412.0%
      Source: The Illiopolis, 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.