September 5, 2026 — Has El Niño reached the West Coast?
You might think it has. After all, the ocean off Southern and Central California is unusually warm. But that is from a recent marine heatwave predates the current El Niño. Much of the Pacific Coast is experiencing relatively normal conditions while still awaiting the impacts of what could be a very strong El Niño.
In June, NOAA’s National Weather Service declared that El Niño had developed. That finding, however, is based on ocean temperatures from the tropical Pacific Ocean, near the Equator, which warm ahead of El Niño’s impact on the Americas.
While eastern tropical Pacific temperatures have already risen more than 2°C (about 3.6°F) above normal, El Niño-related warming along the West Coast typically lags that increase by a few months. NOAA Fisheries scientists are tracking West Coast conditions as part of our Integrated Ecosystem Assessment. Here are some of the changes in ocean conditions and marine life that typically signal the arrival of El Niño’s influence along the West Coast.