Planning for the weather is a good way to make your trip to Yudanaka Shibu Onsen relaxing and enjoyable, especially when you’re splurging. The hottest months are usually August and July, with an average temperature of 21°C, while the coldest months are January and February, with an average of 0°C. The rainiest months in Yudanaka Shibu Onsen are July, December, January and August, with each month seeing an average of 258 mm of rainfall.