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