October in Milford Sound is the rainiest and the windiest month of the year. In October, the weather in Milford Sound is typically cold. Average daily high temperature in October is about 7 degrees above zero. On average, Milford Sound has 25 rainy, 5 sunny, and 1 partly cloudy day in October. The rains are usually heavy. October as well as January, February, March, and April is considered the most uncomfortable time to visit Milford Sound.