Taking into account the local weather in Yuzhno-Sakhalinsk can help you maximize your time at the pool during your trip. The hottest months are usually August and July with an average temp of 59°F, while the coldest months are February and January with an average of 16°F. The snowiest months in Yuzhno-Sakhalinsk are March, January, February, and December, with each month seeing an average of 98 inches of snowfall.