January in Devonport is the sunniest and the warmest month of the year. In January, the weather in Devonport is typically warm. Average daily high temperature in January is about 20 degrees above zero. On average, Devonport has 17 sunny, 12 partly cloudy, and 2 rainy days in January. The rains are usually light. January as well as February is considered the most comfortable time to visit Devonport.