May in Andorra la Vella is the rainiest and the cloudiest month of the year. In May, the weather in Andorra la Vella is typically warm. Average daily high temperature in May is about 13 degrees above zero. On average, Andorra la Vella has 18 rainy, 6 partly cloudy, 5 sunny, and 2 cloudy days in May. The rains are usually heavy. May as well as January, February, March, and April is considered the most uncomfortable time to visit Andorra la Vella.