Planning for the weather is a good way to make your trip to Douala relaxing and enjoyable, especially when you’re splurging. The hottest months are usually February and January with an average temp of 82°F, while the coldest months are July and August with an average of 77°F. The rainiest months in Douala are September, August, July, and October, with each month seeing an average of 17 inches of rainfall.