An East Sussex Fire and Rescue Service spokesman said three engines responded to a call at 2.43pm this afternoon.
Sussex Police and Shoreham Coastguard were also in attendance.
The fires were brought under control at 4.03pm, said the fire service spokesman, and the boats had been left with the owner.
The spokesman said there were no reports of anybody injured and the cause of the fires was still unknown.
A report from the scene said both boats had been 'destroyed'.
