October in Ketchikan is the rainiest month of the year. In October, the weather in Ketchikan is typically cold. Average daily high temperature in October is about 9 degrees above zero. On average, Ketchikan has 23 rainy, 4 partly cloudy, 3 sunny, and 1 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 Ketchikan.