In May, the weather in Bandar Seri Begawan is typically hot. Average daily high temperature in May is about 30 degrees above zero. On average, Bandar Seri Begawan has 28 rainy, 2 sunny, and 1 cloudy day in May. The rains are usually heavy. May as well as January, February, March, and April is considered the most uncomfortable time to visit Bandar Seri Begawan.