Weather will likely play an important role when you plan your trip to Kirundo, but bear 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 temperature of 21°C, while the coldest months are December and January, with an average of 19°C. The rainiest months in Kirundo are November, December, April and March, with each month seeing an average of 240 mm of rainfall.