TODAY NOV14
TEMPERATURE23
HUMIDITY78
PRESSURE30.58
WIND COND.50 6.9
  • 3426Thu90%
  • 4731Fri
  • 4532Sat
  • 3926Sun20%30%
  • 4229Mon
daynightWeather update from St. Louis Downtown Airport at

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

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Compare Waterloo, IL Weather To Other Cities

Waterloo 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.
IndexWaterlooIllinoisNational
Air quality index604150
Pollution index6,055,6403,347,2955,066,862

Waterloo 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

Waterloo air quality information

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

Average monthly Waterloo temperature with heat index

Waterloo monthly precipitation with daily maximum

Waterloo monthly snow depth with daily maximum

Waterloo monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Columbia, IL10,1936020%
Freeburg, IL4,1116020%
Millstadt, IL3,9116020%
Shiloh, IL13,0506020%
Affton, MO22,0606020%
Waterloo, IL10,1976020%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Rockport, TX10,1973922%
Eunice, LA10,1994412%
Columbia, IL10,1936020%
Little Canada, MN10,2024412%
Marlton, NJ10,1875714%
Waterloo, IL10,1976020%
Source: The Waterloo, 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.