May in Miercurea-Ciuc is the rainiest month of the year. In May, the weather in Miercurea-Ciuc is typically warm. Average daily high temperature in May is about 15 degrees above zero. On average, Miercurea-Ciuc has 23 rainy, 7 sunny, and 1 partly cloudy day in May. The rains are usually heavy. May as well as February, March, and April is considered the most uncomfortable time to visit Miercurea-Ciuc.