If you're hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Bururi: The hottest months are usually September and August, with an average temperature of 20°C, while the coldest months are June and May, with an average of 18°C. The rainiest months in Bururi are November, April, December and March, with each month seeing an average of 202 mm of rainfall.