TODAY MAY15
TEMPERATURE59
HUMIDITY55
PRESSURE30.23
WIND COND.210 5.4
  • 7260Sun70%70%
  • 7161Mon70%70%
  • 7664Tue60%50%
  • 8066Wed50%60%
  • 8165Thu40%50%
daynightWeather update from St. Louis Downtown Airport at

Key findings

  • The highest monthly average temperature in Swansea for July is 77.9 degrees
  • The lowest monthly average temperature in Swansea for January is 31.8 degrees
  • The most monthly precipitation in Swansea occurs in April with 10.2 inches
  • The air quality index in Swansea is 9% worse than the national average
  • The pollution index in Swansea is 20% worse than the national average

Compare Swansea, IL Weather

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      Swansea 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
      January23°F42°F32°F5.6"
      February25°F45°F34°F3.8"
      March37°F59°F47°F7.1"
      April47°F70°F57°F10.2"
      May56°F77°F66°F8.9"
      June65°F87°F76°F9.2"
      July68°F89°F78°F8.0"
      August66°F88°F76°F7.8"
      September58°F82°F69°F8.4"
      October47°F70°F57°F8.6"
      November36°F57°F46°F6.9"
      December28°F45°F36°F8.2"

      Swansea 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.
      IndexSwanseaIllinoisNational
      Air quality index544150
      Pollution index6,055,6403,347,2955,066,862

      Swansea air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality134
      Days with moderate air quality221
      Days w/ poor A.Q. for sensitive groups8
      Days with unhealthy air quality2

      Swansea air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.070%
      Carbon Tetrachloride0.040%
      Lead0.100%
      Mercury0.230%

      Average monthly Swansea temperature with heat index

      Swansea monthly precipitation with daily maximum

      Swansea monthly snow depth with daily maximum

      Swansea monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      St. Jacob, IL1,354548%
      Caseyville, IL4,263548%
      Washington Park, IL4,029548%
      Cahokia, IL14,574548%
      Shiloh, IL13,050548%
      Swansea, IL13,722548%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Jericho, NY13,730512%
      Ephrata, PA13,7144510%
      Wixom, MI13,7334020%
      Riverhead, NY13,7344118%
      Belle Chasse, LA13,7094510%
      Swansea, IL13,722548%
      Source: The Swansea, 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.