If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Nishinoomote: The hottest months are usually August and July with an average temp of 80°F, while the coldest months are January and February with an average of 58°F. The rainiest months in Nishinoomote are June, September, July, and May, with each month seeing an average of 14 inches of rainfall.