June in Barcelona is the rainiest and the cloudiest month of the year. In June, the weather in Barcelona is typically warm. Average daily high temperature in June is about 26 degrees above zero. On average, Barcelona has 15 rainy, 8 partly cloudy, 4 cloudy, and 3 sunny days in June. The rains are usually moderate. June as well as July and August is considered the most uncomfortable time to visit Barcelona.