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Islip is located in Suffolk County, New York. There are roughly 337,059 residents, living in 103,902 households. The average temperature for Islip this time of the year is low of 65F and high of 82F. On average, Islip gets about 3.61 inches of precipitation in July. Most residents are home owners (75%), have a post secondary degree (46%) and are single, no kids (32%).