Stay stoked, surfer dudes, another swell is heading for O'ahu's south shore.

The National Weather Service says a southeast swell generated by storm systems near Easter Island should arrive today, bringing waves of 7 to 10 feet. A high-surf advisory remains in effect until 6 p.m. today and could be extended.

Waves of 5 to 8 feet hit O'ahu's south-facing beaches yesterday, and lifeguards stayed busy as surfers, swimmers and sailors took the waters.

Lifeguards yesterday made 19 rescues, assisted 35 people having trouble in the water and did 563 "preventive actions" — generally meaning they warned people not to do something dangerous — at Waikiki and Ala Moana beaches, said Bryan Cheplic, spokesman for the city's Emergency Services Department.

"It was pretty steady," Cheplic said.

No serious injuries were reported.

Hot weather continued as the temperature yesterday reached 92. It was the seventh straight day that the high was 90 or better. Today should be more of the same — high waves and heat, according to the National Weather Service.

One person rescued amid the waves was Art Mersereau, 71, who got into trouble sailing off Waikiki and was brought to shore by a lifeguard.

The veteran sailor's 14-foot Laser-class boat capsized off Fort DeRussy Beach yesterday afternoon and dumped Mersereau into the drink.

Mersereau, of Manoa, was sailing solo around 12:20 p.m. when he entered the Kaiser Channel and a swell capsized the boat about a quarter-mile offshore.

"I was coming into the channel, and I was in good shape," Mersereau said after the rescue. "But then I lost the wind, and I was just a sitting duck."

As waves battered Mersereau's boat, breaking it apart, a lifeguard on a Yamaha Waverunner brought him ashore.

"I'm an old salt," Mersereau said, standing on the beach in his helmet and life jacket. "I've been sailing in and out of here for years."