July weather forecast in Duncan

July in Duncan is the rainiest, the cloudiest, and the hottest month of the year. In July, the weather in Duncan is typically hot. Average daily high temperature in July is about 31 degrees above zero. On average, Duncan has 15 rainy, 9 partly cloudy, 6 sunny, and 1 cloudy day in July. The rains are usually heavy. July as well as January, June, August, and December is considered the most uncomfortable time to visit Duncan.