Weather is probably a major factor when you plan your trip to Yuzhno-Sakhalinsk, and keep in mind that cheaper options are usually available when the weather isn't as good. 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.