October in Greymouth is the rainiest, the windiest, and the cloudiest month of the year. In October, the weather in Greymouth is typically warm. Average daily high temperature in October is about 13 degrees above zero. On average, Greymouth has 20 rainy, 6 partly cloudy, 3 sunny, and 2 cloudy days in October. The rains are usually heavy. October as well as April, May, June, and July is considered the most uncomfortable time to visit Greymouth.