If you're hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Bururi: The hottest months are usually September and August with an average temp of 68°F, while the coldest months are June and May with an average of 65°F. The rainiest months in Bururi are November, April, December, and March, with each month seeing an average of 8 inches of rainfall.