October in Duncan is the sunniest month of the year. In October, the weather in Duncan is typically warm. Average daily high temperature in October is about 22 degrees above zero. On average, Duncan has 17 sunny, 7 rainy, 5 partly cloudy, and 2 cloudy days in October. The rains are usually heavy. October as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Duncan.