In June, the weather in Phnom Penh is typically hot. Average daily high temperature in June is about 34 degrees above zero. On average, Phnom Penh has 24 rainy, 3 partly cloudy, 2 cloudy, and 1 sunny day in June. The rains are usually heavy. June as well as April, May, July, and August is considered the most uncomfortable time to visit Phnom Penh.