If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Douala: The hottest months are usually February and January, with an average temperature of 28°C, while the coldest months are July and August, with an average of 25°C. The rainiest months in Douala are September, August, July and October, with each month seeing an average of 430 mm of rainfall.