Weather can make or break a roadtrip, so here's some data about year-round temperatures in Mamfe to help you plan yours: The hottest months are usually February and January with an average temp of 79°F, while the coldest months are January and July with an average of 75°F. The rainiest months in Mamfe are September, October, July, and August, with each month seeing an average of 22 inches of rainfall.