Marconi Beach in Wellfleet was closed to swimmers for a short time Tuesday afternoon after a great white shark was spotted offshore, officials said.

A lifeguard spotted the shark at 12:15 p.m. about 40 yards off the coast, Cape Cod National Seashore Acting Chief Ranger Ryan Wright said. The lifeguard decided to close the beach for an hour following the sighting, he said, and the beach is now open.

This was the first shark sighting at a protected beach this season, Wright said. It is unclear whether the shark was previously tagged or named, he said.

“The weather was overcast today, so the beach was not particularly heavily visited,” Wright said.


Alyssa Lukpat can be reached at alyssa.lukpat@globe.com. Follow her on Twitter @AlyssaLukpat.