December in Penang is the windiest and the sunniest month of the year. In December, the weather in Penang is typically hot. Average daily high temperature in December is about 29 degrees above zero. On average, Penang has 21 rainy, 5 partly cloudy, 3 sunny, and 2 cloudy days in December. The rains are usually heavy. December as well as January, February, March, and April is considered the most uncomfortable time to visit Penang.