If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Kawasaki: 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 46°F. The rainiest months in Kawasaki are October, September, June, and July, with each month seeing an average of 8 inches of rainfall.