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Osterville is located in Barnstable County, Massachusetts. There are roughly 3,441 residents, living in 1,579 households. The average temperature for Osterville this time of the year is low of 56F and high of 73F. On average, Osterville gets about 3.36 inches of precipitation in June. Most residents are home owners (82%), have a post secondary degree (65%) and are single, no kids (43%).