The inshore lifeboat from Selsey launched at on Sunday morning, at the request of the UK Coastguard.
Information had been received from a member of the public that a windsurfer appeared to be having problems near Pagham Yacht Club.
After a search, the crew could not see the windsurfer but they were then told he was further to the east.
The windsurfer was found at 12.18pm in good spirits but was tired, saying his rigging had failed and he had been in the water for an hour.
The weather was wind south westerly force 5 sea state moderate in sunshine.
The casualty said he did not need medical treatment so the helmsman took him straight to the beach, then returned for the board and rigging.
Once the rig was recovered, the lifeboat returned to the beach. The owner and rig were then taken back to the yacht club beach where the coastguard team from Selsey were waiting.
The lifeboat returned to the station and was rehoused,washed down and refuelled.
The crew involved were helmsman Sam Corcoran- Smith, Will Moir and Max Wiseman.