Why Do Whales Come to Hermanus

Walker Bay sits at a rare convergence point where the Agulhas Current meets the cold Benguela system, creating a thermal boundary that concentrates plankton and krill within meters of the shoreline. Southern right whales evolved to exploit exactly this kind of coastal upwelling zone—their baleen filters are designed for dense, slow-moving prey clouds rather than open-ocean hunting. The reason why whales come to Hermanus rather than neighboring bays comes down to bathymetry. The seabed here rises abruptly from 30 meters to less than 10 within a few hundred meters of the Cliff Path, forming a natural amphitheater that shelters newborn calves from swells and predators. Females return to the same calving grounds year after year, a behavior known as site fidelity, and genetic studies confirm that multiple generations of southern right whales have chosen Hermanus for over a century. The Old Harbour records whale sightings dating to the 1840s, when the town's original industry was shore-based whaling—an industry that decimated the population before international protection began in 1935. Today the species has rebounded to an estimated 4,000 individuals in South African waters, and Walker Bay remains their primary nursery. Cow-calf pairs stay close to shore for three to four months, the calves gaining up to 50 kilograms per day on milk that is 60 percent fat. The shallow water warms faster than the open ocean, reducing thermoregulatory stress on newborns, and the rocky coastline provides acoustic cover that masks their calls from passing orcas. These factors—shelter, warmth, nutrients, and safety—combine to answer why whales come to Hermanus with such predictable regularity. The same geographic features that made the town a whaling station in the 19th century now make it the only place in the world where you can watch southern right whales from a walking path, without a boat, on any clear winter morning.