TODAY AUG20
TEMPERATURE73
HUMIDITY82
PRESSURE29.86
WIND COND.100 13.9
  • 7755Tue30%20%
  • 7654Wed
  • 7858Thu
  • 7664Fri
  • 8568Sat
daynightWeather update from Illinois Valley Regional Airport at

Ottawa 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
January18°F34°F26°F3.3"
February19°F35°F26°F3.0"
March32°F51°F40°F4.3"
April42°F64°F52°F7.2"
May53°F75°F63°F8.0"
June62°F83°F72°F7.5"
July66°F85°F75°F7.1"
August64°F83°F73°F8.2"
September56°F78°F66°F6.3"
October45°F65°F54°F6.6"
November34°F51°F42°F4.3"
December23°F37°F30°F3.5"

Did you know?

  • The highest monthly average temperature in Ottawa for July is 75 degrees.
  • The lowest monthly average temperature in Ottawa for January is 26 degrees.
  • The most monthly precipitation in Ottawa occurs in August with 8.2 inches.
  • The air quality index in Ottawa is 97% better than the national average.
  • The pollution index in Ottawa is 63% better than the national average.

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Compare Ottawa, IL Weather To Other Cities

Ottawa 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.
IndexOttawaIllinoisNational
Air quality index14150
Pollution index1,874,4903,347,2955,066,862

Ottawa air quality information

MeasurementTotal
Days measured351
Days with good air quality351
Days with moderate air quality
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Ottawa air quality information

PollutantTotal
Arsenic0.002%
Benzene0.030%
Carbon Tetrachloride0.010%
Lead0.010%
Mercury0.010%

Average monthly Ottawa temperature with heat index

Ottawa monthly precipitation with daily maximum

Ottawa monthly snow depth with daily maximum

Ottawa monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Dayton, IL520198%
LaSalle, IL9,484198%
Millington, IL629198%
Oglesby, IL3,834198%
Tonica, IL794198%
Ottawa, IL18,707198%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Middleton, WI18,7074216%
Thomasville, GA18,7063628%
South Burlington, VT18,7043628%
Fairmont, WV18,699365630%
Augusta, ME18,6912942%
Ottawa, IL18,707198%
Source: The Ottawa, 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.