July in Milford Sound is the coldest month of the year. In July, the weather in Milford Sound is typically cold. Average daily high temperature in July is about 5 degrees above zero. On average, Milford Sound has 19 rainy, 7 sunny, 3 partly cloudy, and 2 cloudy days in July. The rains are usually heavy. July as well as January, February, March, and April is considered the most uncomfortable time to visit Milford Sound.