October in Niagara Falls is the rainiest month of the year. In October, the weather in Niagara Falls is typically warm. Average daily high temperature in October is about 14 degrees above zero. On average, Niagara Falls 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 Niagara Falls.