In May, the weather in Valdez is typically cold. Average daily high temperature in May is about 3 degrees above zero. On average, Valdez has 17 rainy, 5 sunny, 5 cloudy, 2 snowy, and 2 partly cloudy days in May. The rains are usually heavy. May as well as June, July, August, and September is considered the most uncomfortable time to visit Valdez.