Taking into account the local weather in Sobetsu is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually August and July with an average temp of 65°F, while the coldest months are February and January with an average of 28°F. The snowiest months in Sobetsu are January, February, March, and December, with each month seeing an average of 30 inches of snowfall.