May in Salla is the rainiest month of the year. In May, the weather in Salla is typically warm. Average daily high temperature in May is about 8 degrees above zero. On average, Salla has 22 rainy, 6 cloudy, and 3 sunny days in May. The rains are usually light. May as well as January, April, June, and July is considered the most uncomfortable time to visit Salla.