May in Concordia is the cloudiest month of the year. In May, the weather in Concordia is typically warm. Average daily high temperature in May is about 20 degrees above zero. On average, Concordia has 11 sunny, 8 partly cloudy, 7 rainy, and 5 cloudy days in May. The rains are usually heavy. May as well as April, August, and September is considered the most comfortable time to visit Concordia.