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Grain Valley is located in Jackson County, Missouri. There are roughly 9,996 residents, living in 3,605 households. The average temperature for Grain Valley this time of the year is low of 68F and high of 89F. On average, Grain Valley gets about 4.23 inches of precipitation in July. Most residents are home owners (61%), have a post secondary degree (58%) and are single, no kids (31%).