July in Overland Park is the hottest month of the year. In July, the weather in Overland Park is typically hot. Average daily high temperature in July is about 31 degrees above zero. On average, Overland Park has 14 sunny, 9 rainy, 7 partly cloudy, and 1 cloudy day in July. The rains are usually heavy. July as well as January, February, March, and May is considered the most uncomfortable time to visit Overland Park.