October in Welland is the rainiest month of the year. In October, the weather in Welland is typically warm. Average daily high temperature in October is about 14 degrees above zero. On average, Welland has 18 rainy, 6 sunny, 4 cloudy, and 3 partly cloudy days in October. The rains are usually moderate. October as well as March, April, November, and December is considered the most uncomfortable time to visit Welland.