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Union-Grapeview is located in Mason County, Washington. There are roughly 13,455 residents, living in 5,741 households. The average temperature for Union-Grapeview this time of the year is low of 39F and high of 60F. On average, Union-Grapeview gets about 4.49 inches of precipitation in April. Most residents are home owners (87%), have a post secondary degree (60%) and are married, no kids (45%).