October in Nagasaki is the sunniest month of the year. In October, the weather in Nagasaki is typically warm. Average daily high temperature in October is about 22 degrees above zero. On average, Nagasaki has 13 sunny, 10 partly cloudy, 7 rainy, and 1 cloudy day in October. The rains are usually heavy. October as well as May is considered the most comfortable time to visit Nagasaki.