If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Anabara Onsen: The hottest months are usually August and July, with an average temperature of 22°C, while the coldest months are January and February, with an average of 1°C. The rainiest months in Anabara Onsen are September, August, July and October, with each month seeing an average of 208 mm of rainfall.