Weather is probably a major factor when you plan your trip to Ouesso, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually January and February, with an average temperature of 27°C, while the coldest months are September and October, with an average of 25°C. The rainiest months in Ouesso are October, September, November and April, with each month seeing an average of 199 mm of rainfall.