When you travel with your pet, keeping tabs on the weather can help you make the trip more safe and fun for everyone. 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.