In October, the weather in Bainbridge Island is typically warm. Average daily high temperature in October is about 14 degrees above zero. On average, Bainbridge Island has 16 rainy, 7 sunny, 7 partly cloudy, 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 Bainbridge Island.