TODAY MAY30
TEMPERATURE68
HUMIDITY53
PRESSURE30.22
WIND COND.30 5.8
  • 7556Sun
  • 8064Mon
  • 8870Tue
  • 9070Wed20%
  • 8870Thu30%30%
daynightWeather update from St. Louis Downtown Airport at
How would you rate the weather in Swansea?
Write a review to give others more information about this area.
How would you rate the air quality in Swansea?
Write a review to give others more information about this area.
See all Swansea poll results

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"

Did you know?

  • The highest monthly average temperature in Swansea for July is 78 degrees.
  • The lowest monthly average temperature in Swansea for January is 32 degrees.
  • The most monthly precipitation in Swansea occurs in April with 10.2 inches.
  • The air quality index in Swansea is 21% worse than the national average.
  • The pollution index in Swansea is 20% worse than the national average.

Compare Swansea, IL Weather To Other Cities

      vs

      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 index604150
      Pollution index6,055,6403,347,2955,066,862

      Swansea air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality99
      Days with moderate air quality231
      Days w/ poor A.Q. for sensitive groups33
      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.
      Alorton, IL1,9086020%
      Caseyville, IL4,2636020%
      Dupo, IL3,9666020%
      Fairview Heights, IL16,7936020%
      Glen Carbon, IL12,7826020%
      Swansea, IL13,7226020%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Jericho, NY13,730536%
      Ephrata, PA13,7144510%
      Wixom, MI13,7333432%
      Riverhead, NY13,734492%
      Belle Chasse, LA13,7094510%
      Swansea, IL13,7226020%
      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.