If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Bouna: The hottest months are usually February and March, with an average temperature of 30°C, while the coldest months are January and August, with an average of 27°C. The rainiest months in Bouna are August, September, July and October, with each month seeing an average of 204 mm of rainfall.