July in Desná is the warmest month of the year. In July, the weather in Desná is typically warm. Average daily high temperature in July is about 20 degrees above zero. On average, Desná has 23 rainy, 7 sunny, and 1 partly cloudy day in July. The rains are usually heavy. July as well as March, April, May, and June is considered the most uncomfortable time to visit Desná.