If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Nishinoomote: The hottest months are usually August and July, with an average temperature of 27°C, while the coldest months are January and February, with an average of 14°C. The rainiest months in Nishinoomote are June, September, July and May, with each month seeing an average of 344 mm of rainfall.