Planning for the weather is an important factor for making your trip to Kinugawa Onsen a success, 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 1°C. The rainiest months in Kinugawa Onsen are July, September, October and June, with each month seeing an average of 264 mm of rainfall.