June in Bintulu is the sunniest and the hottest month of the year. In June, the weather in Bintulu is typically hot. Average daily high temperature in June is about 30 degrees above zero. On average, Bintulu has 22 rainy, 4 cloudy, 3 sunny, and 1 partly cloudy day in June. The rains are usually heavy. June as well as January, February, March, and April is considered the most uncomfortable time to visit Bintulu.