Haiti’s Civil Defense Department told CNN there were deaths and damage.
According to the US Tsunami Warning System, a tsunami threat issued for the region is over.
The earthquake was about 12 kilometers (7.5 miles) northeast of Saint-Louis-du-Sud and 13 kilometers deep, according to the US Geological Survey (USGS).
An aftershock measuring 5.2 on the Richter scale struck about 12 miles (20 kilometers) northwest of Cavaillon, Haiti, later in the morning, according to the USGS.
Haiti is in the cone of Tropical Storm Grace, and the storm could impact the area Monday through Tuesday, CNN meteorologist Haley Brink said.
CNN’s Theresa Waldrop contributed to this report.