Planning for the weather is a good way to make your trip to Tsukioka Onsen relaxing and enjoyable, especially when you're splurging. The hottest months are usually August and July, with an average temperature of 23°C, while the coldest months are February and January, with an average of 3°C. The rainiest months in Tsukioka Onsen are July, December, January and August, with each month seeing an average of 257 mm of rainfall.