May in Vitoria is the rainiest month of the year. In May, the weather in Vitoria is typically warm. Average daily high temperature in May is about 16 degrees above zero. On average, Vitoria has 21 rainy, 5 sunny, and 5 cloudy days in May. The rains are usually moderate. May as well as January, February, March, and April is considered the most uncomfortable time to visit Vitoria.