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Timber Lake-Harstine Island is located in Mason County, Washington. There are roughly 7,422 residents, living in 3,142 households. The average temperature for Timber Lake-Harstine Island this time of the year is low of 39F and high of 59F. On average, Timber Lake-Harstine Island gets about 3.89 inches of precipitation in April. Most residents are home owners (86%), have a post secondary degree (63%) and are married, no kids (41%).