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Grayslake is located in Lake County, Illinois. There are roughly 19,792 residents, living in 7,313 households. The average temperature for Grayslake this time of the year is low of 56F and high of 79F. On average, Grayslake gets about 3.97 inches of precipitation in June. Most residents are home owners (79%), have a post secondary degree (63%) and are married, with kids (32%).