Planning for the weather is a good way to make your trip to Hanashiki Onsen relaxing and enjoyable, especially when you’re splurging. The hottest months are usually August and July, with an average temperature of 19°C, while the coldest months are January and February, with an average of -1°C. The rainiest months in Hanashiki Onsen are July, August, June and September, with each month seeing an average of 246 mm of rainfall.