June in Ha Long is the windiest and the hottest month of the year. In June, the weather in Ha Long is typically hot. Average daily high temperature in June is about 31 degrees above zero. On average, Ha Long has 23 rainy, 4 partly cloudy, 2 cloudy, and 1 sunny day in June. The rains are usually heavy. June as well as May, July, August, and September is considered the most uncomfortable time to visit Ha Long.