If you're looking forward to lots of outings with your partner, check out these details about year-round temperatures in Port Harcourt: The hottest months are usually January and February with an average temp of 80°F, while the coldest months are August and July with an average of 75°F. The rainiest months in Port Harcourt are September, June, July, and October, with each month seeing an average of 17 inches of rainfall.