Weather will likely play an important role when you plan your trip to Sekigane Onsen, but bear in mind that cheaper options are usually available when the weather isn’t as good. The hottest months are usually August and July, with an average temperature of 24°C, while the coldest months are January and February, with an average of 6°C. The rainiest months in Sekigane Onsen are July, September, August and June, with each month seeing an average of 287 mm of rainfall.