October in Huntsville is the rainiest month of the year. In October, the weather in Huntsville is typically warm. Average daily high temperature in October is about 10 degrees above zero. On average, Huntsville has 19 rainy, 6 sunny, 4 partly cloudy, and 2 cloudy days in October. The rains are usually heavy. October as well as April and November is considered the most uncomfortable time to visit Huntsville.