TODAY NOV24
TEMPERATURE63
HUMIDITY48
PRESSURE101220
WIND COND.180 22.3
  • 6230Mon30%
  • 4835Tue
  • 5336Wed20%
  • 4423
  • 4021Fri
daynightWeather update from Marion - Williamson County Regional Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Marion for July is 78.6 degrees
  • The lowest monthly average temperature in Marion for January is 34.8 degrees
  • The most monthly precipitation in Marion occurs in June with 13.3 inches
  • The air quality index in Marion is 2% worse than the national average
  • The pollution index in Marion is 95% better than the national average

Compare Marion, IL Weather

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      Marion 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
      January27°F44°F35°F2.5"
      February29°F46°F37°F1.6"
      March40°F59°F49°F4.1"
      April50°F70°F59°F10.7"
      May58°F78°F68°F10.5"
      June67°F87°F77°F13.3"
      July70°F88°F79°F0.5"
      August68°F88°F77°F0.4"
      September61°F81°F70°F1.2"
      October50°F70°F59°F0.8"
      November39°F58°F48°F5.8"
      December32°F47°F39°F1.2"

      Marion 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.
      IndexMarionIllinoisNational
      Air quality index434142
      Pollution index125,3593,148,6942,726,193

      Marion air quality

      MeasurementTotal
      Days measured344
      Days with good air quality269
      Days with moderate air quality74
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.000%
      Benzene0.003%
      Carbon Tetrachloride0.000%
      Lead0.000%
      Mercury0.000%

      Average monthly Marion temperature with heat index

      Marion monthly precipitation with daily maximum

      Marion monthly snow depth with daily maximum

      Marion monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Zeigler, IL1,7794314.0%
      Crainville, IL1,3724314.0%
      Whiteash, IL834314.0%
      Herrin, IL12,8064314.0%
      Orient, IL4344314.0%
      Marion, IL17,5394314.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Godfrey, IL17,540548.0%
      Lithia Springs, GA17,545524.0%
      Bostonia, CA17,5326428.0%
      Wantagh, NY17,548512.0%
      Manassas Park, VA17,548476.0%
      Marion, IL17,5394314.0%
      Source: The Marion, 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.