This weekend Shona Lorigan will be on a coastal headland, joining thousands of others around the country scanning the horizon for whales.

Sunday marks the annual national humpback migration census day run by Ms Lorigan's marine mammal rescue group, ORCCA and conducted by hundreds of eager volunteers. Every indication points to another record year.

As of 4pm on Saturday, June 24, 2209 humpback whales had been sighted passing Cape Solander near the entrance to Botany Bay since May 24, almost 50 per cent more than a year ago, according to the National Parks and Wildlife Service.

"All of us love to be around them, they are truly majestic creatures," Ms Lorigan said. "We're so fortunate to be able to experience them literally off every headland."