Current weather conditions temporarily unavailable!

Key findings

  • 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 18% better than the national average
  • The pollution index in Eureka is 87% better than the national average

Compare Eureka, IL Weather

      vs
      How would you rate the weather in Eureka?
      Write a review to give others more information about this area.
      How would you rate the air quality in Eureka?
      Write a review to give others more information about this area.
      See all Eureka poll results

      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 index414150
      Pollution index672,0313,347,2955,066,862

      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

      City, StatePopulationAir Quality IndexNational Avg.
      Metamora, IL3,6324118%
      Rome, IL1,7544118%
      Morton, IL16,3434118%
      Chillicothe, IL6,1694118%
      Benson, IL4584118%
      Eureka, IL5,8274118%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Progreso, TX5,8264216%
      Carrizo Springs, TX5,8282550%
      Norwood, NJ5,828512%
      Wailea, HI5,8331570%
      Stratmoor, CO5,8214510%
      Eureka, IL5,8274118%
      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.