July in Farmington is the rainiest and the cloudiest month of the year. In July, the weather in Farmington is typically hot. Average daily high temperature in July is about 29 degrees above zero. On average, Farmington has 13 rainy, 9 partly cloudy, 8 sunny, and 1 cloudy day in July. The rains are usually heavy. July as well as January, February, and December is considered the most uncomfortable time to visit Farmington.