December in Pekan Baru is the coldest month of the year. In December, the weather in Pekan Baru is typically hot. Average daily high temperature in December is about 28 degrees above zero. On average, Pekan Baru has 31 rainy 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 Pekan Baru.