Warmer Pacific waters from a strong El Niño are expected to push juvenile great white sharks and other species toward California beaches [1, 2].
This migration shifts the natural range of several predatory species, potentially bringing sharks to coastal areas that have historically seen few sightings. The movement is driven by rising ocean surface temperatures that make northern waters more hospitable for younger sharks and their prey [1, 2].
Marine researchers and NOAA forecasters said the warming trend is tied to a significant climatic event. There is an 81% probability of a very strong El Niño developing this fall [3]. This phenomenon heats the ocean surface, which expands the range of prey and allows juvenile sharks to travel further north from Mexico [1, 2].
Species expected to move include juvenile great whites, hammerheads, bull sharks, and tiger sharks [2]. These animals typically prefer warmer environments, and the current temperature anomalies are creating a bridge for them to reach the California coastline, particularly in areas north of the Mexico-U.S. border [1, 2].
Sightings have already begun to appear as early as February 2026 [2]. Experts said the frequency of these encounters will rise throughout the summer months as the water continues to warm [1, 2].
While these sightings may increase, the sharks are primarily following food sources and temperature gradients. The presence of juvenile sharks is a direct response to the environmental shifts caused by the El Niño cycle, a recurring climate pattern that affects global weather and marine ecosystems [1, 3].
“Warmer Pacific waters from a strong El Niño are expected to push juvenile great white sharks and other species northward.”
The northward migration of juvenile sharks illustrates how rapid changes in ocean temperature can immediately alter marine biodiversity and human-wildlife interactions. Because El Niño affects the entire Pacific ecosystem, the increase in sightings is not an isolated event but a symptom of a larger climatic shift that disrupts traditional migration patterns and prey distribution.
