In May, the weather in Yuzhno-Sakhalinsk is typically warm. Average daily high temperature in May is about 12 degrees above zero. On average, Yuzhno-Sakhalinsk has 11 rainy, 7 sunny, 7 partly cloudy, and 6 cloudy days in May. The rains are usually heavy. May as well as January, April, October, and November is considered the most uncomfortable time to visit Yuzhno-Sakhalinsk.