Nearly 25 firefighters arrived around 7:40 a.m. to find the vessel, a Boston Whaler, engulfed in flames.
The fire was extinguished by 8:05 a.m.
No injuries were reported and no fuel leaks have been detected. However, the boat is considered to be a total loss, HFD said.
The state Department of Land and Natural Resources was dispatched to assess.
The cause of the fire is still under investigation.