July in Lisbon is the windiest and the sunniest month of the year. In July, the weather in Lisbon is typically warm. Average daily high temperature in July is about 23 degrees above zero. On average, Lisbon has 25 sunny, 5 partly cloudy, and 1 rainy day in July. The rains are usually light. July as well as August is considered the most comfortable time to visit Lisbon.