TODAY OCT10
TEMPERATURE69
HUMIDITY52
PRESSURE102300
WIND COND.
  • 8756Fri
  • 8150Sat
  • 7040Sun
  • 6035
  • 5833Tue
daynightWeather update from Macomb Municipal Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Marietta for July is 74.7 degrees
  • The lowest monthly average temperature in Marietta for January is 25.9 degrees
  • The most monthly precipitation in Marietta occurs in June with 10.8 inches
  • The air quality index in Marietta is 3% better than the national average
  • The pollution index in Marietta is 63% better than the national average

Compare Marietta, IL Weather

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      Marietta 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°F35°F26°F3.6"
      February19°F38°F27°F3.0"
      March33°F53°F42°F3.4"
      April43°F67°F54°F5.4"
      May53°F76°F64°F7.4"
      June63°F84°F73°F10.8"
      July65°F85°F75°F8.6"
      August63°F84°F73°F8.8"
      September55°F80°F66°F8.0"
      October44°F68°F55°F8.3"
      November33°F54°F42°F6.4"
      December23°F38°F30°F5.1"

      Marietta 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.
      IndexMariettaIllinoisNational
      Air quality index414142
      Pollution index1,001,7103,148,6942,726,193

      Marietta air quality

      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

      Air quality details

      PollutantTotal
      Arsenic0.004%
      Benzene0.040%
      Carbon Tetrachloride0.000%
      Lead0.010%
      Mercury0.020%

      Average monthly Marietta temperature with heat index

      Marietta monthly precipitation with daily maximum

      Marietta monthly snow depth with daily maximum

      Marietta monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Bardolph, IL2772942.0%
      Bushnell, IL2,7892942.0%
      Good Hope, IL4052942.0%
      Industry, IL5402942.0%
      Adair, IL1792942.0%
      Marietta, IL614118.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Klukwan, AK612060.0%
      Jennette, AR614510.0%
      Yucca, AZ611374.0%
      Mount Hebron, CA612942.0%
      Rodriguez Camp, CA616734.0%
      Marietta, IL614118.0%
      Source: The Marietta, 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.