 On August 16 , Cindy made its closest point of approach to Puerto Rico , although its center remained well south of the island . Impact from the storm was thus limited to intermittent downpours and 8 ft ( 2 @.@ 4 m ) waves along the southern coast . The rough seas caused some minor erosion to beach facilities . According to a report from the United States Geological Survey ( USGS ) , a maximum of 5 @.@ 54 in ( 141 mm ) of rain fell near Río Cerrillos in Ponce , though the highest measurement from the Weather Prediction Center ( WPC ) was 4 @.@ 60 in ( 117 mm ) at Puerto Real in Cabo Rojo . Many other locations received rainfall amounts of 2 @.@ 0 – 4 @.@ 5 in ( 50 – 115 mm ) , which flooded some roads and low @-@ lying areas . 
