January in Penrith is the warmest month of the year. In January, the weather in Penrith is typically warm. Average daily high temperature in January is about 26 degrees above zero. On average, Penrith has 14 sunny, 10 rainy, 6 partly cloudy, and 1 cloudy day in January. The rains are usually moderate. January as well as February and June is considered the most uncomfortable time to visit Penrith.