In May, the weather in Yuzhno-Sakhalinsk is typically warm. Average daily high temperature in May is about 10 degrees above zero. On average, Yuzhno-Sakhalinsk has 12 rainy, 9 cloudy, 6 sunny, and 4 partly cloudy days in May. The rains are usually moderate. May as well as January, February, April, and October is considered the most uncomfortable time to visit Yuzhno-Sakhalinsk.