If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Kitakyushu: The hottest months are usually August and July with an average temp of 77°F, while the coldest months are January and February with an average of 47°F. The rainiest months in Kitakyushu are July, June, August, and September, with each month seeing an average of 11 inches of rainfall.