Uganda's Coffee exports have slumped to 4.7 percent in response to the disruption in the weather patterns.
The decline was lower than the 9.3 percent decline forecast by the authority on May 18.
According to Uganda Coffee development Authority, the rains in May disrupted harvesting and drying of the crop.
David Kiwanuka, spokesperson of the Uganda Coffee Development Authority, told Bloomberg that coffee Shipments fell to 220,620 60-kilogram (132-pound) bags, from 231,442 bags a year earlier.
Uganda is Africa's second-biggest producer of coffee, after Ethiopia, and Africa's biggest producer of the Robusta variety of the crop.
Robusta coffee accounts for about 85 percent of the country's annual output.
Kiwanuka says that Exports surpassed an earlier forecast of 210,000 bags because of an improvement in the new harvest in the southern and southwestern region.