TODAY AUG14
TEMPERATURE73
HUMIDITY100
PRESSURE29.99
WIND COND.
  • 8868Fri
  • 8967Sat
  • 8464Sun
  • 8462Mon
  • 8160Tue
daynightWeather update from St. Louis Downtown Airport at

Key findings

  • The highest monthly average temperature in St. Louis for July is 79 degrees
  • The lowest monthly average temperature in St. Louis for January is 32 degrees
  • The most monthly precipitation in St. Louis occurs in April with 5.3 inches
  • The air quality index in St. Louis is 9% worse than the national average
  • The pollution index in St. Louis is 67% worse than the national average

Compare St. Louis, MO Weather

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      St. Louis 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
      January24°F43°F32°F1.8"
      February26°F45°F34°F1.6"
      March37°F59°F47°F3.7"
      April47°F70°F58°F5.3"
      May56°F78°F67°F4.8"
      June65°F88°F76°F4.4"
      July68°F90°F79°F3.9"
      August66°F89°F77°F3.1"
      September58°F82°F69°F4.2"
      October47°F71°F58°F3.1"
      November36°F58°F46°F2.8"
      December29°F45°F36°F3.1"

      St. Louis 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.
      IndexSt. LouisMissouriNational
      Air quality index549750
      Pollution index8,473,0502,360,5665,066,862

      St. Louis 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

      St. Louis air quality information

      PollutantTotal
      Arsenic0.020%
      Benzene0.070%
      Carbon Tetrachloride0.020%
      Lead0.010%
      Mercury0.010%

      Average monthly St. Louis temperature with heat index

      St. Louis monthly precipitation with daily maximum

      St. Louis monthly snow depth with daily maximum

      St. Louis monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Dupo, IL3,966548%
      Fairmont City, IL2,349548%
      Hartford, IL1,569548%
      Mitchell, IL1,183548%
      Smithton, IL3,792548%
      St. Louis, MO316,030548%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Riverside, CA318,6788978%
      Corpus Christi, TX320,0504216%
      Lexington-Fayette, KY311,5294216%
      Pittsburgh, PA305,3055612%
      Stockton, CA301,4434510%
      St. Louis, MO316,030548%
      Source: The St. Louis, MO 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.