TODAY FEB29
TEMPERATURE-3
HUMIDITY63
PRESSURE103150
WIND COND.
  • 5131Thu
  • 5036Fri50%
  • 6752Sat
  • 7658Sun
  • 7348Mon30%50%
daynightWeather update from St. Louis Downtown Airport at
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Weather Quick Facts

  • The highest monthly average temperature in St. Louis for July is 78.8 degrees
  • The lowest monthly average temperature in St. Louis for January is 32.5 degrees
  • The most monthly precipitation in St. Louis occurs in April with 5.3 inches
  • The air quality index in St. Louis is 28% worse than the national average
  • The pollution index in St. Louis is 211% 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 index549742
      Pollution index8,473,0501,630,2552,726,193

      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

      CityPopulationAir Quality IndexNational Avg.
      Black Jack, MO6,930548.0%
      Glen Carbon, IL12,468548.0%
      Roxana, IL1,570548.0%
      Caseyville, IL4,203548.0%
      Clayton, MO16,763548.0%
      St. Louis, MO304,709548.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      St. Paul, MN305,877468.0%
      Cincinnati, OH302,687548.0%
      Pittsburgh, PA301,2865612.0%
      Henderson, NV309,955548.0%
      Stockton, CA311,1034510.0%
      St. Louis, MO304,709548.0%
      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.