TODAY AUG17
TEMPERATURE79
HUMIDITY85
PRESSURE29.94
WIND COND.
  • 8569Fri40%20%
  • 8667Sat
  • 8770Sun
  • 8466Mon50%60%
  • 8063Tue20%20%
daynightWeather update from St. Louis Downtown Airport at

Caseyville Average Weather

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
January28°F43°F35°F11.3"
February26°F43°F33°F3.1"
March39°F61°F49°F5.3"
April45°F68°F56°F5.9"
May56°F80°F68°F4.4"
June65°F88°F76°F4.0"
July67°F88°F77°F9.1"
August69°F91°F79°F7.4"
September60°F84°F71°F8.8"
October48°F72°F59°F4.0"
November37°F59°F47°F8.5"
December27°F42°F34°F3.1"

Did you know?

  • The highest monthly average temperature in Caseyville for August is 79 degrees.
  • The lowest monthly average temperature in Caseyville for February is 33 degrees.
  • The most monthly precipitation in Caseyville occurs in January with 11.3 inches.
  • The air quality index in Caseyville is 20% worse than the national average.
  • The pollution index in Caseyville is 19% worse than the national average.

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Compare Caseyville, IL Weather To Other Cities

Caseyville 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.
IndexCaseyvilleIllinoisNational
Air quality index604150
Pollution index6,055,6403,347,2955,066,862

Caseyville 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

Caseyville air quality information

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

Average monthly Caseyville temperature with heat index

Caseyville monthly precipitation with daily maximum

Caseyville monthly snow depth with daily maximum

Caseyville monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Bella Villa, MO8466020%
Calverton Park, MO1,2436020%
Dellwood, MO5,0206020%
Glen Echo Park, MO1326020%
Lemay, MO16,7626020%
Caseyville, IL4,2636020%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Walhalla, SC4,2632746%
Beecher, IL4,2646020%
Vine Hill, CA4,2644314%
Highlands-Baywood Park, CA4,261484%
Columbiana, AL4,26550= 100
Caseyville, IL4,2636020%
Source: The Caseyville, 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.