July in Tarragona is the sunniest month of the year. In July, the weather in Tarragona is typically warm. Average daily high temperature in July is about 25 degrees above zero. On average, Tarragona has 28 sunny, 2 partly cloudy, and 1 rainy day in July. The rains are usually light. July as well as June and August is considered the most comfortable time to visit Tarragona.