Folly Beach is located at 32°39'16" North, 79°56'25" West (32.654722, -79.940278).
According to the United States Census Bureau, the city has a total area of 18.64 mi2 (48.28 km2). 12.26 mi2 (31.74 km2) of it is land and 6.38 mi2 (16.54 km2) of it is covered by water. The total area is 34.25% water.
Folly Beach is located in the Eastern Standard Time (EST) timezone, GMT-05:00. It observes Daylight Saving Time (DST).