TODAY MAR29
TEMPERATURE40
HUMIDITY70
PRESSURE101800
WIND COND.80 11.2
  • 6542Sat20%
  • 5947Sun50%80%
  • 6542Mon90%90%
  • 5233Tue40%
  • 5032Wed
daynightWeather update from Peoria - General Downing-Peoria International Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Eureka for July is 76.3 degrees
  • The lowest monthly average temperature in Eureka for January is 25.9 degrees
  • The most monthly precipitation in Eureka occurs in June with 5.4 inches
  • The air quality index in Eureka is 3% better than the national average
  • The pollution index in Eureka is 75% better than the national average

Compare Eureka, IL Weather

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      Eureka 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°F37°F26°F2.3"
      February18°F39°F28°F2.1"
      March31°F54°F42°F3.1"
      April41°F67°F54°F4.7"
      May51°F77°F64°F4.4"
      June62°F85°F73°F5.4"
      July65°F88°F76°F3.4"
      August64°F86°F74°F3.5"
      September56°F81°F68°F4.1"
      October44°F68°F55°F3.4"
      November33°F55°F43°F2.9"
      December22°F39°F30°F2.7"

      Eureka 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.
      IndexEurekaIllinoisNational
      Air quality index414142
      Pollution index672,0313,148,6942,726,193

      Eureka air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality285
      Days with moderate air quality78
      Days w/ poor A.Q. for sensitive groups2
      Days with unhealthy air quality0

      Eureka air quality information

      PollutantTotal
      Arsenic0.001%
      Benzene0.030%
      Carbon Tetrachloride0.000%
      Lead0.001%
      Mercury0.020%

      Average monthly Eureka temperature with heat index

      Eureka monthly precipitation with daily maximum

      Eureka monthly snow depth with daily maximum

      Eureka monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Spring Bay, IL4734118.0%
      Washington, IL16,5554118.0%
      Germantown Hills, IL3,4214118.0%
      Roanoke, IL1,8804118.0%
      Washburn, IL1,1094118.0%
      Eureka, IL5,4854118.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Anamosa, IA5,4843922.0%
      Saint-Roch-de-l'Achigan, QC5,486n/a 
      Chadron, NE5,4821962.0%
      Glencoe, MN5,488468.0%
      Orchard Homes, MT5,4804020.0%
      Eureka, IL5,4854118.0%
      Source: The Eureka, 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.