Weather will likely play an important role when you plan your trip to Bolgatanga, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually March and April, with an average temperature of 33°C, while the coldest months are January and December, with an average of 28°C. The rainiest months in Bolgatanga are August, September, July and June, with each month seeing an average of 189 mm of rainfall.