July in Yuzhno-Sakhalinsk is the rainiest month of the year. In July, the weather in Yuzhno-Sakhalinsk is typically warm. Average daily high temperature in July is about 19 degrees above zero. On average, Yuzhno-Sakhalinsk has 14 rainy, 11 cloudy, 5 sunny, and 1 partly cloudy day in July. The rains are usually heavy.