Planning for the weather is a good way to make your trip to Yufuin relaxing and enjoyable, especially when you’re splurging. The hottest months are usually August and July with an average temp of 74°F, while the coldest months are January and February with an average of 43°F. The rainiest months in Yufuin are June, July, September, and August, with each month seeing an average of 11 inches of rainfall.