Weather will likely play an important role when you plan your trip to Mahama, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and September with an average temp of 70°F, while the coldest months are December and January with an average of 67°F. The rainiest months in Mahama are November, December, April, and March, with each month seeing an average of 9 inches of rainfall.