Taking into account the local weather in Goshokage Onsen 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 64°F, while the coldest months are January and February with an average of 24°F. The rainiest months in Goshokage Onsen are July, August, September, and October, with each month seeing an average of 9 inches of rainfall.