Weather will likely play an important role when you plan your trip to Bo, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually April and March, with an average temperature of 28°C, while the coldest months are January and December, with an average of 23°C. The rainiest months in Bo are August, July, September and June, with each month seeing an average of 300 mm of rainfall.