October in Gananoque is the rainiest month of the year. In October, the weather in Gananoque is typically warm. Average daily high temperature in October is about 13 degrees above zero. On average, Gananoque has 15 rainy, 7 sunny, 5 partly cloudy, and 4 cloudy days in October. The rains are usually heavy. October as well as March, April, November, and December is considered the most uncomfortable time to visit Gananoque.