The PWWA says the species had mostly disappeared from the area more than a decade ago and is usually found in these kinds of numbers much farther north.
"With the world's oceans in such trouble and whale and dolphin populations plummeting in so many places, it's great to report the comeback of any wildlife to a particular area," said Michael Harris, executive director of PWWA, in a statement.
"When these guys turn up, they really put on a show. The entire ocean seems to explode with life."
The video, captured by the Pacific Whale Watch Association, is slowed down in parts so you can appreciate the show.
MORE VIDEO | Pacific Whale Watch Association
On mobile? Click here to see more video of the dolphins.