October in Stephenville is the rainiest month of the year. In October, the weather in Stephenville is typically cold. Average daily high temperature in October is about 9 degrees above zero. On average, Stephenville has 18 rainy, 6 sunny, 5 partly cloudy, and 2 cloudy days in October. The rains are usually heavy. October as well as April, May, June, and July is considered the most uncomfortable time to visit Stephenville.