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Oswego is located in Kendall County, Illinois. There are roughly 25,194 residents, living in 8,421 households. The average temperature for Oswego this time of the year is low of 58F and high of 81F. On average, Oswego gets about 4.22 inches of precipitation in June. Most residents are home owners (86%), have a post secondary degree (66%) and are married, with kids (40%).